Xiaoqing went to the store and bought a pen and a bottle of ink. The price of the fountain pen is 7.6 yuan, and the price of the ink is 5.12 yuan cheaper than that of the fountain pen. Xiaoqing paid 50 yuan, how much should I get back?
小青到商店买了一支钢笔和一瓶墨水．钢笔售价7.6元，墨水的售价比钢笔便宜5.12元．小青付出50元，应找回多少元？
<gadget id="calculator">7.6 - 5.12</gadget>
<output>2.48</output>

<gadget id="calculator">7.6 + 2.48</gadget>
<output>10.08</output>

<gadget id="calculator">50 - 10.08</gadget>
<output>39.92</output>

<result>39.92</result>