A person bought a set of clothes at a 20% discount and saved 15 yuan. How much did he spend?
某人以八折优惠价购进一套衣服节省了15元钱，他花了多少元．
<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>