A set of children's clothing is 60 yuan after a 20% discount. How much is the price reduction for this set of children's clothing?
一套儿童服装打八折后是60元，这套儿童服装降价了多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">60 / (4/5)</gadget>
<output>75</output>

<gadget id="calculator">75 - 60</gadget>
<output>15</output>

<result>15</result>