Zhang Qiong opened a children's clothing store. The pricing principle of clothing is: the selling price of clothing is the purchase price of clothing plus 50% of the purchase price. It is known that the selling price of a set of boys' clothes is 180 yuan. How much is the purchase price of this set of boys' clothes?
张琼开了一个童装店，服装的定价原则是：卖出服装的价格是服装进货价加上进货价的50%．已知一套男童装的卖出价格是180元．请问这套男童装的进货价是多少钱？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">180 / (3/2)</gadget>
<output>120</output>

<result>120</result>