"Science World" is 87.5 yuan per set, and "Up and Down Five Thousand Years" is 62.5 yuan per set. Teacher Wang bought 4 sets of each of these two books. How much is the total cost?
《科学大世界》每套87.5元，《上下五千年》每套62.5元．王老师买了这两种书各4套，一共需要多少元？
<gadget id="calculator">87.5 + 62.5</gadget>
<output>150</output>

<gadget id="calculator">150 * 4</gadget>
<output>600</output>

<result>600</result>