n = number of payments (???this is what you are finding???)
interest rate as a decimal
number of times compounded per year
Once I plug in the value and use Logarithms to solve for n:
i=
PV=PMT(-
1-(1+i)"
i
80,000-8000
1-(1+.003925)"
0.003925
-)
0.471
12
=0.003925
