Xiaojun took 10 yuan to the store to buy stationery. He bought a pen and a pencil case and spent a total of 6.45 yuan. How much should the salesperson give him?
小军拿着10元钱去商店买文具，他买了一枝钢笔和一个文具盒一共花了6.45元，营业员应找给他多少元钱．
<gadget id="calculator">10 - 6.45</gadget>
<output>3.55</output>

<result>3.55</result>