Chemical Engineering Plant Economics
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

R/(1 + i)n
R(1 + i)n
R[((1 + i)n - 1)/i]
[((1 + i)n - 1)/i(1 + i)n]

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