During the "61" Children's Day, Hefei Jiulongzhu Children's Shoes City, sports shoes will be 20% off. Xiaomin bought a pair of sports shoes for 240 yuan. How much cheaper are these shoes than the original price?
"六一"儿童节期间，合肥九龙珠儿童鞋城，运动鞋一律八折．小敏买一双运动鞋用了240元，这双鞋比原价便宜了多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">240 / (4/5)</gadget>
<output>300</output>

<gadget id="calculator">300 - 240</gadget>
<output>60</output>

<result>60</result>