Mom goes to the store to buy rice. A bag of rice is 36.9 yuan. Mom pays 50 yuan. How much should I get back?
妈妈去商店买大米，一袋大米36.9元，妈妈付出50元，应找回多少元．
<gadget id="calculator">50 - 36.9</gadget>
<output>13.1</output>

<result>13.1</result>