The original price of a sweater is 200 yuan, how much is it selling for 15% off now?
一件毛衣原价是200元，现在打八五折出售多少元．
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">200 * (17/20)</gadget>
<output>170</output>

<result>170</result>