A strip of wall footing 3 feet wide is located 3.5 feet below the ground surface. Supporting soil has a unit weight of 125 pcf. The results of laboratory tests on the soil samples indicated that the supporting soil's cohesion and angle of internal friction are 1200 psf and 25 degrees, respectively. Groundwater was not encountered during subsurface soil exploration. Determine the allowable bearing capacity, using a factor of safety of 3.