There is a sweater in the store, the price is 12,000 yuan, which is 40% cheaper than the original price, how much is the original price?
商店有一款毛衣，售价12000元，比原价便宜40%，原价多少元．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">12_000 / (3/5)</gadget>
<output>20_000</output>

<result>20_000</result>