A swimming pool is 30 ft wide and 60 ft long and its bottom is an inclined plane, the shallow end having a depth of 2 ft and the deep end, 10 ft. Assume the pool is full of water. What is the volume of the pool? (in cubic feet)
a) 900 ft³
b) 1200 ft³
c) 1500 ft³
d) 1800 ft³