Question: The balance, B, in dollars, in a bank account depends on the amount deposited, A dollars, the annual interest rate, r%, and the time, t, in months since the deposit, so B = f(A, r, t).
(a) Is f an increasing or decreasing function of A? Of r? Of t?
(b) Interpret the statement f(1250, 1, 25) ≈ 1276. Give units.