A coat is sold at a 20% discount. If the original price is 1600 yuan, how much is it cheaper now?
一件大衣8折出售，如果原价1600元，现在便宜了多少元．
<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">1_600 * (1/5)</gadget>
<output>320</output>

<result>320</result>