The current price of a piece of clothing is 64 yuan after it has been reduced by 20% from the original price. Find the original price. What is the formula?
一件衣服现价比原价降低了20%后是64元，求原价，列式为多少
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

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

<result>80</result>