Final answer:
To provide the local ballet with an annual amount of $150,000 at a 5% interest rate, perpetuity, the benefactor must make an endowment of $3,000,000.
Step-by-step explanation:
To determine how large the endowment must be to provide the local ballet with $150,000 per year into perpetuity at a rate of interest of 5%, we can use the formula for perpetuity:
Perpetuity Value = Annual Cash Flow / Interest Rate
By plugging the values into the formula, we get:
Perpetuity Value = $150,000 / 0.05
Perpetuity Value = $3,000,000
Therefore, the benefactor would need to make an endowment of $3,000,000 to provide the ballet with $150,000 each year indefinitely.