Monty expects to contribute $300 to his TFSA at the end of every month for the next five years. For the subsequent 10 years, he plans to contribute $2000 at the end of each calendar quarter.

How much will be in his TFSA at the end of the 15 years if the funds earn 8% compounded semiannually?(Do not round intermediate calculations and round your final answer to 2 decimal places.)

Future value:

I got answers 168,416.82 the first time, and 70,416.82 the second time and they both came up as wrong.