$(40)$ A simply supported beam with $25ft$ span carries its own weight plus a $6$ in$.$ thick concrete slab, and a live load of $75$ psf from a parking garage floor. The beams are spaced at $15ft\frac{c}{c}.$ Design a rectangular concrete beam with about $30\%$ of maximum reinforcement ratio permitted by ACl. Use $f_c=4$ksi and $f_y=60$ ksi. Please show your complete design in a sketch. You may consider a $1530$ in$.$ beam size as an initial assumption.