Hi there
First find the future value using the formula of compound interest
The formula is
A=p (1+r/k)^kt
A future value?
P present value 9000
R interest rate 0.0236
k compounded monthly 12
T time 11 years
A=9,000×(1+0.0236÷12)^(12×11)
A=11,664.73
Now find the interest earned
I=A-p
I interest earned?
A future value 11664.73
P present value 9000
So
I=11,664.73−9,000
I=2,664.73
Good luck!