VI$.(3$ points$)$ An investor is considering buying a portion of a business. If she places $$250,000,$ the expected payoff is $$50,000$ every year. Assuming that the business does not change in value and that the annual interest rate remains constant. Calculate the annual cost when the interest rate is $21\%$ and when the interest rate is $6\%.$ Afterwards, determine whether the investment is good based on the interest rate. To receive full credit, make sure to show the values of the expected costs.