Xiaohong bought a story book for 5.5 yuan, she paid the salesperson 10 yuan, and the salesperson's aunt gave her back how much yuan.
小红买一本故事书花了5.5元，她付给售货员10元，售货员阿姨给她找回多少元．
<gadget id="calculator">10 - 5.5</gadget>
<output>4.5</output>

<result>4.5</result>