Given: A roof that is 100 feet long, 50 feet wide, with a parapet wall 6 inches high. The roof leaders become plugged and unable to drain. Under such conditions, the roof area will fill up with a volume of ___ gallons of rain water. Select the closest answer.

Given: A roof that is 100 feet long, 50 feet wide, with a parapet wall 6 inches high. The roof leaders become plugged and unable to drain. Under such conditions, the roof area will fill up with a volume of ___ gallons of rain water. Select the closest answer.