Answer:
Y = $391.10
Explanation:
We have 0.125B(n-1) = i
B(n-1) = In = 142.78
So that B(n-1) = 142.78/0.125 = 1142.24
Furthermore, B(n-1) = Px = Pv = P/(1+0.125) = 1142.24
P/1.125 = 1142.24
P = 1142.24*1.125
P = 1285.02.
The total amount of the loan = Principal repaid as of time (n-1) + Principal repaid in last payment
= 6009.12 + 1142.24
= 7151.36
So, the total amount of the loan is 7151.36.
The principal repaid in the first payment Y = 1285.02 - 0.125*7151.36
Y = 1285.02 - 893.92
Y = $391.10