Compute the total volume $($CY$)$ found in the following contour grid with a reference point of $0\mathrm{.}00-ft.$

a$)37,407\mathrm{.}40$

b$)9,500$

c$)10,110$

d$)9,375\mathrm{.}40$

e$)1,122\mathrm{.}40$