Monthly payment if the loan for four years:
 Given:
 Total loan = $7800
 Interest payment = 6.45 % per year 
 Length of payment = 4 years
 Let X= monthly payment in dollars
 X = (7800+ (7800*.0645) (4))/4*12
 X = (7800 + (503.10)4)/48
 X = (7800+2012.40)/48
 X= 9812.40/48
 X = 204.43 (rounded off)