How many years will it take for 8000 to double at a simple interest rate of 6 percent?

6% of 8,000 = 480

Since interest is not compounded, you just keep getting 480 paid once every year.

Mathematically, it takes 8,000/480 = 162/3 years to earn another 8,000. But the

final payment isn't paid until the end of the 17th year. Until that moment, you've

only collected 7,680. Then, at the end of the 17th year, you get the payment

that brings the interest to a total of 8,160.

Note that if the interest had only compounded annually ... you leave the interest in

the account, and at the end of next year, 6% is paid on the total in the account ...

it would double in only 12 years.