71. A bank is offering a new savings account that pays 8% per year. Which formula below shows the
calculation for determining how long it will take a $100 investment to double?
72. In five years, you plan on starting graduate school to earn your MBA. You know that graduate school
can be expensive and you expect you will need $15,000 per year for tuition and other school expenses.
These payments will be made at the BEGINNING of the school year. To have enough money to attend
graduate school, you decide to start saving TODAY by investing in a money market fund that pays 4%
APR with monthly compounding. You will make monthly deposits into the account starting TODAY
for the next five years. How much will you need to deposit each month to have enough savings for
graduate school? (Assume that money that is not withdrawn remains in the account during graduate
school and the MBA will take two years to complete.)
73. As a young graduate, you have plans on buying your dream car in three years. You believe the car will
cost $50,000. You have two sources of money to reach your goal of $50,000. First, you will save
money for the next three years in a money market fund that will return 8% annually. You plan on
making $5,000 annual payments to this fund. You will make yearly investments at the BEGINNING
of the year. The second source of money will be a car loan that you will take out on the day you buy
the car. You anticipate the car dealer to offer you a 6% APR loan with monthly compounding for a
term of 60 months. To buy your dream car, what monthly car payment will you anticipate?