If you invest P dollars in a bank account at an annual interest rate of r%, then after t years you will have B dollars, where

(a) Find dB∕dt, assuming P and r are constant. In terms of money, what does dB∕dt represent?
(b) Find dB∕dr, assuming P and t are constant. In terms of money, what does dB∕dr represent?

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P(1 + 100)'. B = P(1 + ·