Xiaoyue went to the stationery store to buy watercolor pens. If she bought 7 pieces, she would have 7 yuan and 9 cents left; later Xiaoyue decided to buy 13 pens, but only 10 cents left. May I ask: How much money did Xiaoyue bring in total?
小悦去文具店买水彩笔，如果买7支，还能剩7元9角钱；后来小悦决定买13支，结果只剩1角钱．请问：小悦一共带了多少元钱？
<gadget id="calculator">7.9 - 0.1</gadget>
<output>7.8</output>

<gadget id="calculator">13 - 7</gadget>
<output>6</output>

<gadget id="calculator">7.8 / 6</gadget>
<output>1.3</output>

<gadget id="calculator">1.3 * 7</gadget>
<output>9.1</output>

<gadget id="calculator">9.1 + 7.9</gadget>
<output>17</output>

<result>17</result>