Approximately how long will it take $200 to double to $400 when the annual interest rate is 8 1/2. a 6.25 years b 11.75 years c 1.75 years d 8.5 years

Approximately how long will it take $200 to double to $400 when the annual interest rate is 8 1/2. a 6.25 years

b 11.75 years

c 1.75 years

d 8.5 years