A pair of leather shoes is sold at a 10% discount, and customers can spend 20 yuan less than the original price. How much is the original price of this kind of leather shoes?
一双皮鞋九折出售，顾客可以比原价少花20元，这种皮鞋原价多少钱？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">20 / (1/10)</gadget>
<output>200</output>

<result>200</result>