Math
posted by Maria
Andy needs to pay off a loan of $18,000 in 5 years. Find the amortization payment he would need to make each semimonthly pay period (twice a month)at 6% compounded bimonthly, in order to pay off the loan.

Reiny
I understand bimonthly to mean every other month, or 6 times a year.
The main problem here is that the payment period does not coincide with the interest period, so my normal formula does not work
so we will convert the 6% compounded bimonthly to one of i compounded semimonthly since the payment period is semimonthly
so (1+i)24 = (1.1)^6
take the 24th root of both sides
1+i = 1.01^(6/24) = 1.01^(1/4)
1+i = 1.00249
(check:
1.00249^24 = 1.06152..
1.01^6 = 1.06152.. OK )
let the payment be P
he will make 30 of these
P( 1  1.00249^30)/.00249 = 18000
P = 623.44
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