"Six. One" Children's Day Player Hui Supermarket's children's clothing department has a promotional event, all children's clothing is on sale at a 20% discount. Xiao Min's mother bought a set of children's clothing with an original price of 125 yuan. How much cheaper is the original price?
"六．一"童节玩家惠超市童装部搞优惠活动，所有的童装打八折出售，小敏的妈妈买了一套原价125元的童装，"六．一"儿童节买这套童装比原价便宜多少钱？
<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">125 * (1/5)</gadget>
<output>25</output>

<result>25</result>