The school shipped 5 truckloads of coal, and the price of each truckload of coal was 420 yuan. How much did the coal cost in total?
学校运来5车煤，每车煤的价钱是420元，这些煤一共花多少钱？
<gadget id="calculator">420 * 5</gadget>
<output>2_100</output>

<result>2_100</result>