A loan is repaid with monthly payments that start at $320 at the end of the first month and increase by $5 each month until a payment of $950 is made, after which they cease. If the annual effective interest rate is 4%, find the amount of principal in the sixtieth payment.

Respuesta :

Answer:

Carrying value of the principal at the 60th payment: 46,692.98266

Explanation:

First, we need to solve for the present value of the annuity with an arithmetic progression

[tex]c \times a_{n:i} + \frac{h}{i} a_{n:i} - n(1+i)^{-n}[/tex]

c= 320

h= 5

i= 4% / 12 months per year = 0.003333333

n= (950-320)/5 + 1 = 127

we determinate the time of the loan considering each quota increase by 5 dollars and there is a first quota of 320  

PV =  $63,355.72  

Now, we build the amortization schedule and look for the value at the 60th payment:

Period Principal Interest Quota Amortization Carrying

1 63,355.72 211.185746 320 108.814254 63246.90954

2 63246.90954 210.8230318 325 114.1769682 63132.73257

3 63132.73257 210.4424419 330 119.5575581 63013.17501

....

58 48046.98288 160.1566096 605 444.8433904 47602.13949

59 47602.13949 158.6737983 610 451.3262017 47150.81328

60 47150.81328 157.1693776 615 457.8306224 46692.98266

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