A 15% discount on a commodity is 3.6 yuan cheaper than the original price. What is the original price of this commodity?
一种商品打八五折比原定价便宜3.6元，这种商品原定价是多少元．
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">1 - (17/20)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">3.6 / (3/20)</gadget>
<output>24</output>

<result>24</result>