If you invest $4000 at 9% interest compounded annually, in how many years will you have $20,000. give your answer the nearest tenth of year?

18.7 years

Step-by-step explanation:

This is a compound interest problem and the following variables have been given;

Principal = 4000; this is the amount o be invested

APR = 9%; this is the compound interest to be earned

Accumulated amount = 20,000

We are required to determine the duration in years. We apply the compound interest formula;

The next step is to introduce natural logarithms in order to determine n;

The number of years required is thus 18.7 years

i really dont know

step-by-step explanation:

lo.lll

step-by-step explanation: