In the calculations that have been presented so far in this chapter, the interest rate was a variable that you either know or had to estimate. But what if you know the other parameters of a loan or other transaction but not the interest rate? Then you can calculate it using the RATE function.
Here’s an example. Suppose you want to take out a $10,000 personal loan from a friend or family member. They agree with the condition that you repay the loan at $300 per month for three years. You’d like to determine the effective interest rate for this deal—here’s where the RATE function comes in. Is this a good deal, or would you be better off taking a loan from the bank?
The RATE function has the following syntax:
RATE(nper, pmt, pv, fv, type, guess)
The first three arguments are required:
nper is the number of payments for the loan.
pmt is the payment amount.
pv is the present value—the amount of the loan.
Taken From : Manage Your Money and Investments with Microsoft Excel
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