The price of a pair of children's leather shoes after a 20% discount is 120 yuan. What is the original price of this pair of children's leather shoes?
一双儿童皮鞋打八折后的价钱是120元，这双儿童皮鞋的原价是多少元．
<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>