Posted by Sat on Sunday, August 2, 2009 at 3:01am.
Payments of $1,800 and $2,400 were made on a $10,000 variablerate loan 18 and 30 months after the date of the loan. The interest rate was 11.5% compounded semiannually for the first two years and 10.74% compounded monthy thereafter. What amount was owed on the loan after three years?

Compound Interest  drwls, Sunday, August 2, 2009 at 6:05am
This problem has to be solved in steps.
After 18 months (but before the first payment) the amount owed was
10,000*(1 + 0.115/2)^3 = 11,826.09
After making the first $1800 payment, the principal owed is 10,026.09. That increases by a factor 1 + 0.115/2 at 24 months, making the principal 10,602.59.
Then the interest rate goes down. After 30 months, the amount owed is
10,602.59. x (1 + 0.1074/2)
= 11,171.95
Finally, subtract the second payment from the principal and compute the increase during the last six months of the three year period.

Compound Interest  Alexander, Tuesday, July 9, 2013 at 1:08pm
A sum of £12,000 is invested for 5 years at an interest rate of 3.5% compounded annually. Calculate the value of the investment after 5 years.
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