帝国cms灵动标签中价格折扣的计算方式

帝国cms 如何使用灵动标签在列表页内容页计算折扣？
列表页代码

[e:loop={9,6,0,1,'','newstime DESC'}]
        <div class="layui-col-xs4 home-center-product-item"> 
         <div class="product-wrap"> 
          <div class="product-info"> 
           <a href="<?=$bqr['titleurl']?>" title="<?=$bqr['title']?>" target="_blank"> 
            <div class="product-titlepic">
             <img src="<?=$bqr['titlepic']?>" onerror="this.onerror='';src='<?=$bqr['titlepic']?>'" />
            </div> 
 </a> 
          </div> 
<div class="text-info">

              <h1><a href="<?=$bqr['titleurl']?>"><?=$bqr['title']?></a></h1>
<ul class="jglist">
              <li> <span style="text-decoration:line-through"><i class="fa fa-diamond"></i> <?=$bqr['yuanjia']?>点</span> </li>

              <li> <span>节省：</span><span> <?=$bqr['yuanjia']-$bqr['jiage']?> 点</span> </li>

              <li> <span><i class="fa fa-diamond"></i> <?=$bqr['jiage']?>点</span> </li>
            </ul>
<a href="<?=$bqr['titleurl']?>" target="_blank"><span class="buybtn"><i class="fa fa-plus-square"></i> 查看详情</span></a>
<a href="<?=$bqr['pcurl']?>" target="_blank"><span class="buybtn2"><i class="fa fa-desktop"></i> 查看演示</span></a>

        </div>
         </div> 
        </div> 
[/e:loop]

内容页

<?=($navinfor[活动价字段名]/$navinfor[原价字段名])*100?>%