The selling price of a commodity after a 10% discount is 72 yuan. What is the original price of this commodity?
一种商品打九折后的售价是72元，这种商品的原价是多少元．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">72 / (9/10)</gadget>
<output>80</output>

<result>80</result>