IF pada kasus Billing PDAM tidak bekerja

Assalamualaikum Warahmatullahi Wabarakatuh... mas Robby dan Mas Buchori dan teman2 PHPMU mohon bantuan koreksi dari script ini (tarif PDAM jika <10 m3 harga mengikuti 10m3 kalau diatas 10 maka 10x tarif1 dan sisanya di hitung tarif ke 2 ) pada line 186
 
		var jumlah2 = $("#jumlah2");
 
			if ((parseInt(total) - 10 ) >=0 <=10 );
 
			{
			((parseInt(total) - 10 ) * parseInt(tarif2)); 
			} 0
			if ((parseInt(total) - 10 ) <0);
		{ 0;
			}
			else{
			10 * parseInt(tarif2);
			}
 
 
 
 
            $("#jumlah2 ").val(jumlah2 );
 
 
 
script full
 
<?php
    include "inc/koneksi.php";
 
    include "inc/kode.php";
 
?>
 
<div class="panel panel-info">
    <div class="panel-heading">
        <b>Tambah Pemakaian</b>
    </div>
    <div class="panel-body">
        <div class="row">
            <div class="col-md-12">
                <form method="POST" enctype="multipart/form-data">
 
                    <div class="form-group">
                        <label>ID Pemakaian</label>
                        <input class="form-control" type="text" name="id_pakai" value="<?php echo $format; ?>" />
                    </div>
 
                    <div class="form-group">
                        <label>Pelanggan</label>
                        <select name="id_pelanggan" id="id_pelanggan" class="form-control" required>
                        <option value=""></option>
                        <?php
                        // ambil data dari database
                        $query = "select * from tb_pelanggan where status='Aktif'";
                        $hasil = mysqli_query($koneksi, $query);
                        while ($row = mysqli_fetch_array($hasil)) {
                        ?>
                        <option value="<?php echo $row['id_pelanggan'] ?>"><?php echo $row['id_pelanggan'] ?>| <?php echo $row['nama_pelanggan'] ?></option>
                        <?php
                        }
                        ?>
                        </select>
                    </div>
 
                    <div class="form-group">
                        <label>Bulan</label>
                        <select name="id_bulan" id="id_bulan" class="form-control" required>
                        <option value="">-- Pilih Bulan --</option>
                        <?php
                        // ambil data dari database
                        $query = "select * from tb_bulan order by id_bulan asc";
                        $hasil = mysqli_query($koneksi, $query);
                        while ($row = mysqli_fetch_array($hasil)) {
                        ?>
                        <option value="<?php echo $row['id_bulan'] ?>"> <?php echo $row['nama_bulan'] ?></option>
                        <?php
                        }
                        ?>
                        </select>
                    </div>
 
                    <div class="form-group">
                        <label>Tahun</label>
                        <input type="number" class="form-control" min="2021" max="2030" name="tahun" value="2021" placeholder="Masukkan tahun"/>
                    </div>
 
                    <div class="form-group">
                        <label>Meteran Bulan Lalu</label>
                        <input type="text" name="awal" id="awal" class="form-control" placeholder="0" readonly="">
                    </div>
 
                    <div class="form-group">
                        <label>Meteran Bulan Ini</label>
                        <input type="text" name="akhir" id="akhir" class="form-control" placeholder="Meteran bulan ini">
                    </div>
 
                    <div class="form-group mb-0">
                        <label>Pemakaian (Bulan Ini - Bulan lalu)</label>
                        <input type="text" name="total" id="total" class="form-control" placeholder="Pemakaian bulan ini" readonly="" >
                    </div>
 
                    <div class="form-group mb-0">
                        <?php $sql_cek = "select l.tarif1, l.tarif2, l.tarif3 from tb_layanan l inner join tb_pelanggan p where l.id_layanan=p.id_layanan";
                        $query_cek = mysqli_query($koneksi, $sql_cek);
                        $data_cek = mysqli_fetch_array($query_cek,MYSQLI_BOTH);
                        ?>
                        <input type="text" class="form-control" name="tarif1" id="tarif1" value="<?php echo $data_cek['tarif1']; ?>" readonly=""/>
						<input type="text" class="form-control" name="tarif2" id="tarif2" value="<?php echo $data_cek['tarif2']; ?>" readonly=""/>
						<input type="text" class="form-control" name="tarif3" id="tarif3" value="<?php echo $data_cek['tarif3']; ?>" readonly=""/>
                    </div>
 
                    <div class="form-group mb-0">
                        <input type="hidden"  name="harga" id="harga" class="form-control"  readonly="">
                    </div>
 
					  <div class="form-group mb-0">
                        <input type="text"  name="jumlah1" id="jumlah1" class="form-control"  readonly="">
                    </div>
					  <div class="form-group mb-0">
                        <input type="text "  name="jumlah2" id="jumlah2" class="form-control"  readonly="">
                    </div>
 
					<div class="form-group mb-0">
                        <input type="text"  name="jumlah3" id="jumlah3" class="form-control"  readonly="">
                    </div>
 
                    <div>
                        <input type="submit" name="Simpan" value="Simpan" class="btn btn-success" >
 
                    </div>
                </div>
                </form>
            </div>
        </div>
    </div>
</div>
 
<?php
    if (isset ($_POST['Simpan'])){
        //mulai proses simpan data
        $sql_simpan = "INSERT INTO tb_pakai (id_pakai, id_pelanggan, bulan, tahun, awal, akhir, pakai) VALUES (
            '".$_POST['id_pakai']."',
            '".$_POST['id_pelanggan']."',
            '".$_POST['id_bulan']."',
            '".$_POST['tahun']."',
            '".$_POST['awal']."',
            '".$_POST['akhir']."',
            '".$_POST['total']."');";
        $sql_simpan .= "INSERT INTO tb_tagihan (id_pakai, tagihan) VALUES (
            '".$_POST['id_pakai']."',
            '".$_POST['harga']."')";   
        $query_simpan = mysqli_multi_query($koneksi, $sql_simpan);
 
        mysqli_close($koneksi);
 
        if ($query_simpan)
        {
            echo "<script>
                    Swal.fire({title: 'Simpan Berhasil',text: '',icon: 'success',confirmButtonText: 'OK'
                    }).then((result) => {
                        if (result.value) {
                            window.location = 'r1.php?halaman=pakai_tampil';
                        }})</script>";
        }else{
            echo "<script>
                    Swal.fire({title: 'Simpan Gagal',text: '',icon: 'error',confirmButtonText: 'OK'
                    }).then((result) => {
                        if (result.value) {
                            window.location = 'r1.php?halaman=pakai_tambah';
                        }})</script>";
        }
        //selesai proses simpan data
        }
 
 
?>
 
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>  
<script>
    $(document).ready(function(){  
        $('#id_pelanggan').change(function(){  
            var id_pelanggan = $(this).val();  
            $.ajax({  
                url:"super/pakai/proses-ajax.php",  
                method:"POST",  
                data:{id_pelanggan:id_pelanggan},  
                success:function(data){  
                    $('#awal').val(data);  
                }  
            });  
        });  
    }); 
</script>
 
<script type="text/javascript" src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
<script type="text/javascript">
    $(document).ready(function() {
        $("#akhir, #awal").keyup(function() {
            var awal  = $("#awal").val() || 0;
            var akhir = $("#akhir").val();
            var total = parseInt(akhir) - parseInt(awal) ;
            $("#total").val(total);
 
            var tarif1 = $("#tarif1").val();
			var tarif2 = $("#tarif2").val();
			var tarif3 = $("#tarif3").val();
 
			var jumlah1 = 10 * parseInt(tarif1);
			$("#jumlah1").val(jumlah1);
 
 
		var jumlah2 = $("#jumlah2");
 
			if ((parseInt(total) - 10 ) >=0 <=10 );
 
			{
			((parseInt(total) - 10 ) * parseInt(tarif2)); 
			} 0
			if ((parseInt(total) - 10 ) <0);
		{ 0;
			}
			else{
			10 * parseInt(tarif2);
			}
 
 
 
 
            $("#jumlah2 ").val(jumlah2 );
 
			//var jumlah2 = parseInt(total2) * parseInt(tarif2); 
		//	$("#jumlah2").val(jumlah2);
 
 
 
			var jumlah3 = (parseInt(total) - 20) * parseInt(tarif3);
			$("#jumlah3").val(jumlah3);
 
 
            var harga = parseInt(jumlah1) + parseInt(jumlah2);
            $("#harga").val(harga);
 
        });
    });
</script>