The selling price of a commodity is 64 yuan after a 20% discount. What is the original price of this commodity?
一种商品打八折后售价是64元，这种商品原价是多少元．
<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>