A four span one-way slab is supported on 12-in.-wide beams with center-to-center span lengths of 8, 10, 10, and 8 ft (these are the short-span lengths - the longer transverse span length is 25 ft). The slab carries its self-weight, a superimposed dead load of 20 psf, and a live load of 80 psf that cannot be reduced. These loads are unfactored. Select the thinnest possible slab that satisfies minimum thickness requirments - but use the same slab thickness throughout all spans. Assuming = 4500 psi and = 60 ksi, specify reinforcement for the top and bottom of the slab in each principal direction using this format: Short-Span Direction: Top: No. X1 bars at Y1 in., Bot: No. X2 bars at Y2 in. Long-Span Direction: Top: No. X3 bars at Y3 in., Bot: No. X4 bars at Y4 in. Show that the slab has adequate flexural and shear strengths, satisfies minimum thickness requirements, and satisfies the minimum area and maximum spacing requirements in both the long- and short-span directions. Rather than check these at every section, specify top and bottom slab reinforcement for each principal direction that would work throughout the floor system (design based on the worst case