SOURCE

$(function(){
        $("#btn1").click(function() {
             $("#btn1").val("");
             $("#btn2").val("");
        })

		$("#submit").click(function() {
			var a1 = $("#btn1").val()
			if(a1<0){
				$("#btn2").val("").val("不可为负数")
				return;
			}
			var num = Math.floor(a1/1000);	//向下取整、倍数
				num = parseInt(num);
			var num1= Math.abs(a1%1000);		//余数
				num1 = Math.floor(num1/100);
				num1 = parseInt(num1);
				console.log("余数是"+num1);	
			var dikou
			console.log("倍数"+num +"取余"+num1)
			
			if(num == 0 && num1 < 1 ){
				$("#btn2").val("").val("不足最低额度")
				console.log("不足最低额度");
			}else{
				if(num1==0){
					dikou = "0";
				}else if(num1==1){
					dikou = "200";
				}else if(num1==2){
					dikou = "400";
				}else if(num1==3){
					dikou = "700";
				}else if(num1==4){
					dikou = "1000";
				}else if(num1==5){
					dikou = "1400";
				}else if(num1==6){
					dikou = "1800";
				}else if(num1==7){
					dikou = "2100";
				}else if(num1==8){
					dikou = "2400";
				}else if(num1==9){
					dikou = "3000";
				}
				dikou = parseInt(num * 3500) + parseInt(dikou)
				$("#btn2").val("").val(dikou);
				console.log(dikou)

			}

		})
	});

<table id = "test" border='1' style='float:left; margin-right:20px;'>
    <thead>
        <tr>
			<th>业绩额度（万元）</th>
			<th>抵扣罚款（元）</th>
		</tr>
    </thead>
    <tbody>
        <tr>
			<td>100</td>
			<td>200</td>
		</tr>
        <tr>
			<td>200</td>
			<td>400</td>
		</tr>
        <tr>
			<td>300</td>
			<td>700</td>
		</tr>
        <tr>
			<td>400</td>
			<td>1000</td>
		</tr>
        <tr>
			<td>500</td>
			<td>1400</td>
		</tr>
        <tr>
			<td>600</td>
			<td>1800</td>
		</tr>
        <tr>
			<td>700</td>
			<td>2100</td>
		</tr>
        <tr>
			<td>800</td>
			<td>2400</td>
		</tr>
        <tr>
			<td>900</td>
			<td>3000</td>
		</tr>
        <tr>
			<td>1000</td>
			<td>3500</td>
		</tr>
    </tbody>     
</table>
<div style='float:left'>
业绩
<input type="text" id="btn1" placeholder="请输入业绩"><br />
<input type="button" id="submit"  value="查询"><br />
可折扣
<input type="text" id="btn2" disabled >
 </div>