A set of brushes with an original price of 180 yuan is now on sale at a 15% discount in bookstores. How much did Xiao Xin spend on this set of brushes?
原价180元一套的画笔，现在书店打八五折出售，小辛买这套画笔花了多少钱？
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">180 * (17/20)</gadget>
<output>153</output>

<result>153</result>