The store shipped 7 boxes of soap, each box was 36 yuan, sold for 150 yuan, how many pieces are left?
商店运来7箱肥皂，每箱36块，卖掉150块，还剩多少块？
<gadget id="calculator">36 * 7</gadget>
<output>252</output>

<gadget id="calculator">252 - 150</gadget>
<output>102</output>

<result>102</result>