Answer:74880 ft.lb
Step-by-step explanation:
Given
Dimension of pool
base=10 ft
width=20 ft
height=4 ft
Pool is half filled
volume of Pool
mass of water
mass
This pool is in the form parallelepiped therefore average distance
Work 
Answer: About 22%
This is because all of her expenses add up to $800. $175 of those are for her phone and clothes. 175/800 equals about 22 percent. Exact answer is 21.875%