The price of slippers is 10 yuan, and the price of a pair of sandals is 90% higher than that of a pair of slippers, which is exactly 20% of the price of a pair of leather shoes. How much is the price of a pair of leather shoes?
拖鞋售价是10元，一双凉鞋的售价比一双拖鞋高90%，正好是一双皮鞋售价的20%．一双皮鞋的售价是多少元？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 + (9/10)</gadget>
<output>19/10 = around 1.9</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(19/10) / (1/5)</gadget>
<output>19/2 = around 9.5</output>

<gadget id="calculator">10 * (19/2)</gadget>
<output>95</output>

<result>95</result>