In: Finance
At an interest rate of 9 percent, an investment of $1 would double in 8.04 years. How long to the nearest year would it take an investment of $1 to grow four fold (4 times) if the interest rate was only 4 percent?
| a. | 
 12 years  | 
|
| b. | 
 24 years  | 
|
| c. | 
 36 years  | 
|
| d. | 
 48 years  | 
|
| e. | 
 96 years  |