Xiao Pang took 50 yuan to go shopping in the supermarket, bought school supplies and spent 19.37 yuan, and bought 3 packs of potato chips, each bag cost 7.50 yuan, how much money is left?
小胖带了50元钱去超市购物，买学习用品共用去19.37元，还买了3包薯片，每包7.50元，还剩多少元钱？
<gadget id="calculator">7.5 * 3</gadget>
<output>22.5</output>

<gadget id="calculator">19.37 + 22.5</gadget>
<output>41.87</output>

<gadget id="calculator">50 - 41.87</gadget>
<output>8.13</output>

<result>8.13</result>