For a kind of clothing, the cost price of each set is 50 yuan, and the selling price is 80 yuan. During the May Day, the manufacturer will hold a 30% off discount activity. In the bargain activity, how much yuan can the manufacturer earn for each set of clothes sold?
一种服装，每套成本价50元，售价80元，五一节期间，厂家打出售价七折大酬宾活动，在酬宾活动中，厂家每卖出一套衣服可赚得多少元？
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">80 * (7/10)</gadget>
<output>56</output>

<gadget id="calculator">56 - 50</gadget>
<output>6</output>

<result>6</result>