Compound Interest If you deposit $100 in a savings account at the end of each month for 2 years, the balance will be a function f(r) of the interest rate, r%.At 7% interest (compounded monthly), f(7) = 2568.10 and f'(7) = 25.06. Approximately how much additional money would you earn if the bank paid 7 1/2 % interest?
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