Mom bought a top with a 20% discount and spent 64 yuan. What was the original price of this top?
妈妈买了一件打八折的上衣，花了64元，这件上衣的原价是多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">64 / (4/5)</gadget>
<output>80</output>

<result>80</result>