The original price of a coat is 165 yuan, how much is it cheaper with a 20% discount.
一件上衣原价是165元，打8折便宜了多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">165 * (1/5)</gadget>
<output>33</output>

<result>33</result>