The price of a shirt in a shopping mall is 140 yuan. If the price is reduced by 20%, you can still earn 15 yuan. What is the purchase price of this shirt?
商场内一件衬衣的标价为140元，如果降价20%出售，仍可赚15元，这件衬衣的进价是多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">140 * (4/5)</gadget>
<output>112</output>

<gadget id="calculator">112 - 15</gadget>
<output>97</output>

<result>97</result>