$7\mathrm{.}22$ Consider three items with the following profiles:

Item

A

$100$ units

B

$50$ units

C

Annual Demand

$200$ units

Annual Requests

Unit Cube

$25$ requests

$1$f $*$ t $^5$

$5$ requests

$0\mathrm{.}5$f $*$ t $^5$

$16$ requests

$2$f $*$ t $^5$

a$.$ What is the total demand in cube for items A$,$ B$,$ and C

b$.$ If $20$f $*$ t $^3$ of space is allocated for item C$,$ how many times will the item be replen$-$ ished in one year?