The original price of a schoolbag is 45 yuan, how much is the price after the 20% discount?
一个书包的原价是45元，打八折后的价格是多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">45 * (4/5)</gadget>
<output>36</output>

<result>36</result>