Find $A_s$ used for $1-ft$ widths of reinforced concrete slabs,

a$)2\mathrm{.}5$

#$4$ bars with $S=6$ in$.$

$A_s=$

c$)2\mathrm{.}5$

#$3$ bars with $S=8$ in$.$

$A_s=$

b$)2\mathrm{.}5$

#$5$ bars with $S=9$ in$.$

$A_s=$

d$)2\mathrm{.}5$

#$4$ bars with $S=5$ in$.$

$A_s=$