Naughty bought a pair of roller skates with a 20% discount and spent 200 yuan. What is the original price of this pair of shoes?
淘气买了一双打八折的轮滑鞋，用去200元，这双鞋原价是多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">200 / (4/5)</gadget>
<output>250</output>

<result>250</result>