The quality inspection department randomly inspected 50 boxes of a certain brand of pure milk, and found no unqualified products. What is the pass rate of this batch of pure milk?
质量检测部分抽查了50箱某品牌纯牛奶，没有发现不合格，这批纯牛奶的抽检合格率是多少
<gadget id="calculator">50 / 50</gadget>
<output>1</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">1 * 1</gadget>
<output>1</output>

<result>1</result>