Peter is buying a new smart phone today and is financing his purchase with a loan of $999.
If to repay the loan he makes annual payments over the next three years with end of year installments of $388.
What annual interest rate is he paying?
Answer: Annual interest rate = 8.05%.
Calculation and explanation:
$999 is the PV of the 3 annual installments of 388 | |
discounted at the interest rate applicable to the loan. | |
Hence, 999 = 388*PVIFA(r,3), where r = the interest rate | |
of the loan. | |
Solving for r | |
PVIFA(r,3) = 999/388 = 2.5747 | |
The interest rate factor for 8% and 9% are | |
8% = 2.5771, 9% = 2.5313 | |
r = 8%+1%*(2.5771-2.5747)/(2.5771-2.5313) = | 8.05% |
CHECK: | |
388*(1.0805^3-1)/(0.0805*1.0805^3) = | $ 999.01 |
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