Aa Aa 8. Implied interest rate and period Consider the case of the following annuities, and the need to compute either their expected rate of return or duration. Tyler needed money for some unexpected expenses, so he borrowed $2,947.32 from a friend and agreed to repay the loan in four equal installments of $950 at the end of each year. The agreement is offering an implied interest rate of to put Tyler's friend, Dain, wants to go to business school. While his father will share some of the expenses, Dain still needs the rest on his own. But Dain has no money saved for it yet. According to his calculations, it will cost him $40,290 to complete the business program, including tuition, cost of living, and other expenses. He has decided to deposit $4,800 at the end of every year in a mutual fund, from which he expects to earn a fixed 6% rate of return. It will take approximately years for Dain to save enough money to go to business school