A coat is sold for 480 yuan, earning 20%. How much is the purchase price of this coat?
一件上衣卖得480元，赚了20%，这件上衣的进价是多少元？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">480 / (6/5)</gadget>
<output>400</output>

<result>400</result>