The firm's cost of capital is $7$ percent. A and $B$ are mutually exclusive, and $B$ and $C$ are mutually exclusive.

A: $

B: $

C: $

b$.$ What is the internal rate on investment A$?$ Investment B$?$ Investment C$?$ Round your answers to the nearest whole number.

c$.$ Which investment$($s$)$ should the firm make?

The firm should make investment$($s$)$

d$.$ If the firm had unlimited sources of funds, which investment$($s$)$ should it make?

The firm should make investment$($s$)$

e$.$ If there were another alternative, investment $D,$ with an IRR of $6$ percent, which investment$($s$)$ should the firm make?

The firm should make investment$($s$)$

f$.$ If the firm's cost of capital rose to $12$ percent, what effect would that have on investment A$\text{'}$s IRR? Round your answer to the nearest whole number.

If the cost of capital rises to $12$ percent, the IRR of investment $A$

$\%.$