Well, what's your working?
$2000 at 9% per year compound interest, compounded monthly. That is, (9/12)% = 0.75% per month. 6 years is 72 months.
So in 6 years, the compounding will make the $2000 worth:
2000(1+0.0075)^{72} = 3425.11
We put in $2000 originally, so we subtract the $2000 to...