To get monthly payment we use formula
Payment = Present Value - (Future Value / ( ( 1 + i ) ^n) / [ 1- (1 / (1 +i ) ^ n ) ] / i.
Solution to 1a. $210.70
Where i =4.5/12 = 0.00375, FV=4500, PV = 13000, N=48
= { 13000 - (4500/((1+0.00375)^48)) } / (1-(1/(1+0.00375)^48))/0.00375
= $9240 / 43.85
= $210.70
Solution to 1b. $248.24
Explanation:
Where i =4.5/12 = 0.00375, FV=8000, PV = 13000, N=24
={ 13000- (8000/((1+0.00375)^24)) } / (1-(1/(1+0.00375)^24))/0.00375
= $5687.35/22.91
= $248.24
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