Teacher Li has 568 yuan and bought 6 learning materials priced at 88 yuan. How much money is left?
李老师有568元钱，买了6本定价为88元的学习资料，还剩下多少元？
<gadget id="calculator">88 * 6</gadget>
<output>528</output>

<gadget id="calculator">568 - 528</gadget>
<output>40</output>

<result>40</result>