The price of a repeater after a 15% discount is 425 yuan. How much is it cheaper than the original price?
一个复读机八五折后的价格是425元，算一算，比原价便宜了多少元？
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">425 / (17/20)</gadget>
<output>500</output>

<gadget id="calculator">500 - 425</gadget>
<output>75</output>

<result>75</result>