An existing building is suffering from cracks in the exterior walls. the investigating engineer wants to ensure that the foundations are not overloaded. the existing columns carry dead live load of 45,000 pounds. the footings are 3 ft 6 in. x 3 ft 6 in. x 1 ft 6 in. thick and rest on sandy soil. the soils report estimates the allowable soil bearing pressure to be 2500 psf. what would be the smallest area for a safe footings are adequate to carry the load?