Hal is asked to write an exponential function to represent the value of a $10,000 investment decreasing at 2% annually. What multiplicative rate of change should Hal use in his function?
P(1) = P(0) [exp (rt)]
9,800 = 10,000 (0.98)^1
r = loge (0.98) = ln (0.98) = -0.0202
P(t) = P(0)[exp(-0.0202t)]