A person bought a set of clothes at a discounted price of 20% and saved 15 yuan, how much did this person spend on buying the suit?
某人以8折优惠价买了一套衣服，节省15元，则此人买这套衣服用去了多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">15 / (1/5)</gadget>
<output>75</output>

<gadget id="calculator">75 - 15</gadget>
<output>60</output>

<result>60</result>