Compound interest : A = P (1+ r/100)n
one year has 12 months therefore three years will be 3*12 = 36 months.
amount = 1200
p= ?
n = 36
r = 9 % since compounding is in months r will be 9%/12
1200 = p (1 + 9%/12)36
1200 = p (1.0075)36
1200 = p ( 1.3086)
p = 1200/1.3086
P = 917.01
therefore she will be paying approximately $917.
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