Xiao Ming takes 20 yuan to the store to buy stationery, 4.53 yuan to buy a pen, and 5.45 yuan to buy an exercise book. How much should the salesperson give Xiao Ming?
小明拿20元钱去商店买文具，买钢笔用去4.53元，买练习册用去5.45元．售货员应找给小明多少钱？
<gadget id="calculator">4.53 + 5.45</gadget>
<output>9.98</output>

<gadget id="calculator">20 - 9.98</gadget>
<output>10.02</output>

<result>10.02</result>