Barrons AP Calculus

Figure  N9–7a

Figure  N9–7b

Example 15 __

At a yearly rate of 5% compounded continuously, how long does it take (to the
nearest year) for an investment to triple?

SOLUTION:

If P dollars are invested for t yr at 5%, the amount will grow to A = Pe 0.05t in t
yr. We seek t when A = 3 P:

Example 16 __