When a homeowner has a 25-year variable-rate mortgage loan, the monthly payment R is a function of

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When a homeowner has a 25-year variable-rate mortgage loan, the monthly payment R is a function of the amount of the loan A and the current interest rate i (as a percent); that is, R = f (A, i).Interpret each of the following.
(a) f (100,000, 8) =771.82
(b) ∂f/∂I (100,000, 8) = 66.25
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