4. Recall the formula for an annuity, now written as a four-variable function: A(R, r, n, t) = RI(1+r/tr-i where R is the value of the recurring payment, r is the annual percentage rage, n is the number of years the annuity is i ments per year. , and t is the number of pay ДА ДА ДА ДА (a) Compute-R, Or, n. at (b) Suppose R 2000, r-0.06, п-20.ț 12. Úse these numbers to find the numeric values of the partial derivatives computed in part (a). Round your answer to the nearest integer

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