All the goods in the store are sold at a 20% discount. Dad bought a razor and spent 120 yuan. How much did this razor cost?
商店所有货物打八折出售，爸爸买了一个剃须刀花了120元，这种剃须刀原来卖多少元？
<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>