#lang racket
(define (fv i n)
(expt (+ 1 i) n))
(define (pv i n)
(/ 1 (expt (+ 1 i) n)))
(define (annuity-fv i n)
(/ (- (expt (+ 1 i) n) 1) i))
(define (annuity-pv i n)
(/ (- 1 (/ 1 (expt (+ 1 i) n))) i))
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