Problem $1-$ Design the slab shown below. The slab is part of the upper floor of a retail store and is

expected to have a superimposed dead load of $20psf($in addition to its own weight$).$ Use f$\text{'}$c $=4000$

psi, fy $=60,000$ psi and a $\frac{3}{4}"$ concrete cover. Use normal weight concrete.