Xiaoyu goes to the stationery store and buys a pencil case for 5.9 yuan and two diaries for 3.50 yuan. She pays 20 yuan. How much should the salesperson give her?
小玉去文具店买了一个5.9元的文具盒和两个3.50元的日记本，她付款20元，营业员应找她多少元钱？
<gadget id="calculator">3.5 * 2</gadget>
<output>7</output>

<gadget id="calculator">5.9 + 7</gadget>
<output>12.9</output>

<gadget id="calculator">20 - 12.9</gadget>
<output>7.1</output>

<result>7.1</result>