Dad bought a schoolbag for Xiaoyu, the original price was 150 yuan, and now the store sells it at a 20% discount.
爸爸给小雨买了一个书包，原价150元，现在商店打八折出售，爸爸买书包花了多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">150 * (4/5)</gadget>
<output>120</output>

<result>120</result>