The price of a piano is 8,500 yuan, which is 15% lower than the original price. How much is the original price of a piano?
一架钢琴售价8500元，比原来价格降低了15%，原来一架钢琴的价格是多少元？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">8_500 / (17/20)</gadget>
<output>10_000</output>

<result>10_000</result>