Xiaoli buys a pencil case, pays the salesperson 10 yuan, and gets back 1.6 yuan. How much is this pencil case?
小丽买一个笔袋，付给营业员10元，找回1.6元．这个笔袋多少钱？
<gadget id="calculator">10 - 1.6</gadget>
<output>8.4</output>

<result>8.4</result>