Xiao Ming bought 6 pencils and 4 exercise books, each exercise book was 0.68 yuan, and each pencil was 0.24 yuan. Xiao Ming pays 5 yuan, how much should he get back?
小明买了6支铅笔和4本练习本，每本练习本0.68元，每支铅笔0.24元．小明付出5元钱，应找回多少元？
<gadget id="calculator">6 * 0.24</gadget>
<output>1.44</output>

<gadget id="calculator">4 * 0.68</gadget>
<output>2.72</output>

<gadget id="calculator">1.44 + 2.72</gadget>
<output>4.16</output>

<gadget id="calculator">5 - 4.16</gadget>
<output>0.84</output>

<result>0.84</result>