$7\mathrm{.}22$ Consider the investment projects given in Table P$7\mathrm{.}22.$

Assume that MARR $=12\%$ in the following questions.

a$.$ Compute $i^{**}$ for each investment. If the problem has more than one $i^{**},$ identify all of

them.

b$.$ Compute IRR$($true$)$ for each project.

c$.$ Compute the MIRR at MARR $=12\%.$

d$.$ Determine the acceptability of each investment.

Table P$7\mathrm{.}22$