Examples $11-2$ and $11-3$ in this chapter concern a decision between the same two mutually exclusive alternatives under identical conditions, except

for the corporation$$s marginal tax rate. In Example $11-2,$ in which the marginal tax rate was $25$ percent, the conclusion was to accept Alternative $1.$ In Example $11-3,$ in which the marginal tax rate was $15$ percent, the conclusion was to accept Alternative $2.$

Determine the marginal tax rate at which the two alternatives would be economic equivalents, that is$,$ they would $$break even$$

and generate the same excess after$-$tax payoff over after$-$tax cost. Your answer should be based on all conditions and assumptions

stated in Examples $11-2$ and $11-3.$