Please help, shows answer is incorrect but dont lnow why, answer must be in FV function thank you!!

You just graduated from college and your new employer offers a 401(k) where they match your contribution, dollar for dollar. You want to know the accumulated balance in your 401(k), including your employer's contribution, assuming you contribute either $800 per month or $1,000 per month, and the fund earns 8.7% annually