A fountain pen costs 5.85 yuan, which is 2.43 yuan more expensive than a ballpoint pen. Xiao Ming brings 10 yuan to buy a fountain pen and a ballpoint pen. How much should he get back?
一枝钢笔售价5.85元，比一枝圆珠笔贵2.43元，小明带10元钱买一枝钢笔和一枝圆珠笔，应找回多少元？
<gadget id="calculator">5.85 - 2.43</gadget>
<output>3.42</output>

<gadget id="calculator">10 - 3.42 - 5.85</gadget>
<output>0.73</output>

<result>0.73</result>