The original price of "Encyclopedia" is 500 yuan per set. After the actual 15% discount, how much is each set.
《大百科全书》原价每套500元，现实行八五折优惠后，每套多少元．
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

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

<result>425</result>