The price of a washing machine is 1,500 yuan, which is 25% cheaper than the original price, and how much cheaper than the original price.
一台洗衣机售价1500元，比原价便宜25%，比原价便宜多少元．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1_500 / (3/4)</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 - 1_500</gadget>
<output>500</output>

<result>500</result>