3. [15 Points] 0 2 r in MY NOTES An inverted pyramidshaped tank with square cross section shown in the figure below is 10 ft tall with 81 fl:2 cross sectional area at the very top. AL \\'i lb The tank is full up to the 7 ft mark with liquid of weight density 40 ft3' How much work (in ftilb) is required to pump all of the liquid 4 ft above the top of the container? (Round your answer to the nearest integer.) ft-lb Submit