Using the incremental IRR rule, the investment that should be chosen at 7.2% cost of capital is Investment A.
The cost of capital that the decision would change is 15.8%.
Find the cost of capital by equating both values:
Value of perpertuity = Value of growth perperturity
2.3 million / Cost of capital = 1.8 million / (Cost of capital - 3.3% growth rate)
2.3 x Cost of capital - 0.0754 = 1. 8 x cost of capital
(2.3 - 1.8) x cost of capital = 0.0754
Cost of capital = 15.18%
The incremental IRR rule would mean that:
For any rate that is above 15.18%, Investment B should be selected as it would bring a positive return.
Rates below 15.18% should lead to Investment A selected as it would bring a positive return.
At a rate of 7.2% therefore, Investment A should be chosen.
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