The school bought 210 sets of fairy tale books and story books, each set of fairy tale books was 16.8 yuan, and each set of story books was 13.2 yuan. How much did the purchase of these books cost?
学校购买了童话书和故事书各210套，童话书每套16.8元，故事书每套13.2元，购进这些书一共花了多少钱？
<gadget id="calculator">16.8 + 13.2</gadget>
<output>30</output>

<gadget id="calculator">30 * 210</gadget>
<output>6_300</output>

<result>6_300</result>