Use a car to transport cement, 4 times in the morning, with an average of 875 kg each time; 5 times in the afternoon, with an average of 900 kg each time, how many kilograms of cement does this car transport in total a day?
用一辆汽车运送水泥，上午运4次，平均每次运875千克；下午运送5次，平均每次运900千克，这辆汽车一天共运水泥多少千克？
<gadget id="calculator">875 * 4</gadget>
<output>3_500</output>

<gadget id="calculator">900 * 5</gadget>
<output>4_500</output>

<gadget id="calculator">3_500 + 4_500</gadget>
<output>8_000</output>

<result>8_000</result>