After a 20% discount on a piece of clothing, the price is 120 yuan. How much is the original price of this piece of clothing?
一次衣服打完八折后价格是120元，这件衣服原价多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">120 / (4/5)</gadget>
<output>150</output>

<result>150</result>