Xiaohong bought a coat at the mall, priced at 100 yuan, with a 20% discount. How much does Xiaohong actually spend?
小红在商场买了一件上衣，标价100元，八折优惠．小红实际消费多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">100 * (4/5)</gadget>
<output>80</output>

<result>80</result>