The school builds a cuboid fish pond with a length of 50m, a width of 30m, and a depth of 20cm. If cement is applied to the inner wall and bottom of the fish pond, 0.8m**2 can be applied per kilogram of cement. How many kilograms of cement will be needed in total?
学校修一条长50m，宽30m，深20cm的长方体鱼池，如果在鱼池的内壁和底面抹上水泥，每千克水泥可以抹0.8m**2，一共要多少千克水泥？
<gadget id="calculator">50 * 30</gadget>
<output>1_500</output>

<gadget id="calculator">50 * 20 * 2</gadget>
<output>2_000</output>

<gadget id="calculator">30 * 20 * 2</gadget>
<output>1_200</output>

<gadget id="calculator">1_500 + 2_000 + 1_200</gadget>
<output>4_700</output>

<gadget id="calculator">4_700 / 0.8</gadget>
<output>5_875</output>

<result>5_875</result>