You will need to use the total loan cost formula which can be found here: http://www.1728.org/loanfrm4.htm
Total Loan Cost = [(rate * princ)/ (1-(1+r)^-n)] * n where "n" is the number of payments which in this case is 30 the rate is entered as (6.5 / 1,200) or
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Aight so The figure shown above also creates the figure of a triangle The two legs are 5ft and 12ft and the hypotenuse is unknown Hypotenuse= leg square + leg square =(5*5)+(12*12) = 25+144 = 169ft