During New Year's Day, a shopping mall sold sweaters with an original price of 100 yuan at a 15% discount.
元旦期间，一家商场原价100元的毛衣打八五折出售，算一算，这种毛衣售价多少元．
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">100 * (17/20)</gadget>
<output>85</output>

<result>85</result>