A fountain with a circular base is situated at the center of a circular basin. The base of the fountain is 5 ft in diameter. The basin is 10 ft in diameter and 3 ft high.The basin can hold ___π cubic feet of water. What goes in the blank?
( pi r^2 of large basin - pi r^2 of smaller basin ) * 3 ft = ........... pi ft3
NOTE : r = 1/2 of the diameter