question archive Rounding in the calculation of monthly interest rates is discouraged
Subject:MathPrice:2.86 Bought7
Rounding in the calculation of monthly interest rates is discouraged. Such rounding can lead to answers different from those presented here. For long-term loans, the differences may be pronounced.
To buy a car, you borrow $26,000 with a term of five years at an APR of 8%. What is your monthly payment? (Round your answer to the nearest cent.)
$
How much total interest is paid? (Round your answer to the nearest cent.)
$
a. = $527.19
b. = $5631.40
Step-by-step explanation
a. The monthly payment of the loan is given as follows:
we use the formula for the monthly payment of the present value of an annuity payment which is given as follows:
M = P(i/m)/[(1-(1+i/m)-mn)]
where P = $26,000 (present value of the loan), i = 8%, m = 12 (interest compounded monthly), n = 5 years
therefore,
M = $26000(0.08/12)/[(1-(1+0.08/12)-12*5)]
M = $527.1862515
M = $527.19
b. The interest is given as follows:
interest = amount paid - present value of the loan
amount paid = monthly payment * total payment period
amount paid = $527.19 * 12 * 5
amount paid = $31631.40
present value of the loan = $26000
therefore,
interest = amount paid - present value of the loan
interest = $31631.40 - $26000
interest = $5631.40