Uncle Wang bought 200 pairs of new shoes. The cost of each pair of shoes was 50 yuan. He set the profit rate at 60% and sold them. After selling 50 pairs, he found that the sales were obviously slow and there was a risk of backlog, so he decided to sell them at a discount. How much discount can he discount from the current price at most to protect his capital?
王叔叔购进新鞋200双，每双鞋的成本是50元，他把利润率定在60%进行销售，销售了50双后，发现明显滞销，有积压风险，于是他决定打折销售．他最多在现价的基础上打几折才能保本？
<gadget id="calculator">200 * 50</gadget>
<output>10_000</output>

<gadget id="calculator">50 * 50</gadget>
<output>2_500</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">50 * 50 * (3/5)</gadget>
<output>1_500</output>

<gadget id="calculator">10_000 - 2_500 - 1_500</gadget>
<output>6_000</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">200 * 50 * (1/10)</gadget>
<output>1_000</output>

<gadget id="calculator">50 * 50 * (1/10)</gadget>
<output>250</output>

<gadget id="calculator">1_000 - 250</gadget>
<output>750</output>

<gadget id="calculator">6_000 / 750</gadget>
<output>8</output>

<result>8</result>