Summer is here, some spring clothes are now on sale at 20% off, only 120 yuan, how much is the current price cheaper than the original price?
夏季到了，某种春装现在打八折出售，只售120元，现价比原价便宜多少钱？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">150 - 120</gadget>
<output>30</output>

<result>30</result>