In order to find the interest generated, we can use the formula:
Where I is the interest, P is the principal, i is the interest rate and t is the time.
So, using P = 6000, i = 0.04 = t = 4, we have:
So the interest generated in 4 years is $960.
Now, for t = 10, we have:
So the interest generated in 10 years is $2400.