Wang Kun went to a shopping mall and bought a basketball for 49.8 yuan and a volleyball for 48.5 yuan. He paid the cashier 100 yuan. How much should he get back?
王昆到某商场买了一个篮球49.8元，又买了一个排球48.5元，他付给收银员100元，应找回多少元？
<gadget id="calculator">100 - 49.8 - 48.5</gadget>
<output>1.7</output>

<result>1.7</result>