About 2 years

The correct answer is 4yrs. Note the 6% is a "simple rate" meaning she gets 6% on the original investment and not what is earned every year.

6% or .06 of 25,000 = 150 (this is what she makes in 1 year)

6% or .06 of 25,000 = 150 (this is what she makes in 2 years)

etc.

150 x 4yrs = 600:)

6% or .06 of 25,000 = 150 (this is what she makes in 1 year)

6% or .06 of 25,000 = 150 (this is what she makes in 2 years)

etc.

150 x 4yrs = 600:)