A coat is sold at 15% off for 680 yuan, how much is the original price? what is the correct formula
一件大衣按八五折出售为680元，原价是多少元？正确的算式是多少
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">680 / (17/20)</gadget>
<output>800</output>

<result>800</result>