一支笔成本1元，卖5元，五折就是卖2.5元，扣成本
<!----><style type="text/css">html{font-size:375%}</style><link href="https://pics.app.cnyw.net/static/publish/css/style.css?v=1605251010499" rel="stylesheet" position="1" data-qf-origin="/static/publish/css/style.css?v=1605251010499"><!-- 付费贴--> <div class="preview_article "> <!----> <p>一支笔成本1元，卖5元，五折就是卖2.5元，扣成本挣1.5元，如果买一送一就会是卖5元送一支笔，扣2只笔成本2元，挣3元，所以说五折便宜。</p> <!----></div>
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