Payments of $2600, due 50 days ago, and $3100, due in 40 days, are to be replaced by $3000 today and another payment in 30 days. What must the second payment be if the payee is to end up in an equivalent financial position? Money now earns 8.25%. Use 30 days from now as the focal date.

The answer is $2719.68

I really don't know what to do here....