You need to figure out how much 10.1% interest is, by multiplying 10.1 by 8700
Then, since you're trying to find out how large your account balance will be in years and that interest is monthly, you multiply the interest by 12 and then add that on to 8700
After that, you add up the number you got above, 33 times for the 33 years,
Hopefully this helps! :) I appologize in advance if this in incorrect