If an amount R is paid at the end of every year for 'n' years, then the net present value of the annuity at an interest rate of i is

A. R [{(1 + i)n - 1}/ i ]

B. R [{(1 + i)n - 1}/ i (1 + i)n]

C. R(1 + i)n

D. R/(1 + i)n

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