Answer:
you have to maximize the following equation: 0.12A + 0.08B
Where A is the amount of money invested in the high yield fund
Where B is the amount of money invested in the equity fund
A + B = 20,000
A ≥ 3,000
B ≥ 4,000
Using Solver, the optimal solution is to invest $16,000 in A and $4,000 in B. Maximum annual yield = $2,240