Apple Numbers '08 Manual de usuario Pagina 239

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Chapter 12 Dictionary of Functions 239
IPMT
The IPMT function calculates the interest portion of a payment for a loan or investment
at a specified period based on fixed, periodic payments and a fixed interest rate.
IPMT(rate, period, num-periods, present-value, [future-value], [when-due])
 rate: The interest rate for each period.
 period: The period for which you want to find the interest.
 num-periods: The number of periods in the life of the investment.
 present-value: The present value of the loan or investment.
 future-value: Optional; the target future value, if this in an investment. If omitted,
assumed to be 0.
 when-due: Optional; specifies whether payments are made at the beginning or end
of each period:
0 (or omitted) means payments are at the end of each period.
1 means payments are at the beginning of each period.
Notes
Be sure that the interest rate is expressed as the rate per period. For example, if the
interest rate is 10% per year and the payment period is monthly, the rate used in the
function should be 0.1/12 (approximately 0.00833 per month).
Examples
Given the following table:
INTERCEPT(A2:F2, A1:F1) returns 1.
SLOPE(A2:F2, A1:F1) returns 2.
INTERCEPT(A5:F5, A4:F4) returns 2.392.
Examples
To find the interest portion of the first payment on a $1000 loan at 12% annual interest with payments
due at the end of each month:
IPMT(0.12/12, 1, 12, 1000) returns -$10.
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