Xiaoming's mother brought 100 yuan to the grain station to buy things. It was 38.2 yuan to buy oil and 44.5 yuan to buy rice. How much should I get back?
小明的妈妈带100元钱去粮站买东西，买油用去38.2元，买米用去44.5元，应找回多少元？
<gadget id="calculator">38.2 + 44.5</gadget>
<output>82.7</output>

<gadget id="calculator">100 - 82.7</gadget>
<output>17.3</output>

<result>17.3</result>