If the water in the swimming pool in Exercise 27 is 2 m deep, then how much work is required to pump all the water to a level 3 m above the bottom of the pool?

Data from Exercise 27

A swimming pool has the shape of a box with a base that measures 25 m by 15 m and a uniform depth of 2.5 m. How much work is required to pump the water out of the pool when it is full?