Solve the problem PV= $16,838 n=87 i=0.023 pmt=?
There are some problems with your question. Is i=.023 monthly rate, annual rate......etc. If it is monthly rate that means the annual rate is 27.6%!!!!!!.
If that is the case then the monthly payment is $449.43.
Is 87 the number of months? You may clarify these things if you don't agree.