M=Pr(1+r)n/(1+r)n-1
M is the monthyl payment.
P is the principle, or initial amount of the loan
R is the periodic intrest rate
N is the number of payments
For Single Payment loans use this forumla:
APR=Fee/Amount x periods in a year
The periods are.
Annual=1
Semiannul=2
Quartly=4
Monthly=12
Daily=365
