My mother bought me a schoolbag at 62.50 yuan and a stationery box at 16.50 yuan in the supermarket. If I paid 100 yuan, how much should I get back?
妈妈在超市上给我买了一个价格为62.50元的书包和一个16.50元的文具盒，付100元钱，应找回多少元钱．
<gadget id="calculator">62.5 + 16.5</gadget>
<output>79</output>

<gadget id="calculator">100 - 79</gadget>
<output>21</output>

<result>21</result>