Problem $3(20$ points$)$ Show vour work

Design an $8$ inches thick slab is reinforced using # $6$ bars. If the reinforcement ratio $=0\mathrm{.}012,$ the rebar

spacing is most nearly:

a$)18$ in

b$)9\mathrm{.}0$ in

c$)8\mathrm{.}5$ in

d$)5\mathrm{.}0$ in