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;; add-interest: number number -> number
;; Im Folgenden wird aus den Eingaben Kapital und Zinssatz ein
;; Endkapital berechnet. Bei negativem Kapital gibt es keine Zinsen
;; und bei negativem Zinssatz, statt dem Ergebnis eine Fehlermeldung.
(define (add-interest capital interest)
(if (< capital 0) capital
(if (< interest 0)
(error "add-interest: no negative interest rates allowed")
(+(* capital interest) capital))))
;; Tests - these do NOT count as "your" tests!
(check-expect (add-interest 100 0.02) 102)
(check-within (add-interest 1337.15 0.008) 1347.8472 tolerance)
(check-error (add-interest 4711 -0.005) "add-interest: no negative interest rates allowed")
;; === Problem 9.2 ===
;; average-yearly-return: number number number -> number
;; Nun soll der "Durchschnittszinssatz" pro Jahr berechnet werden,
;; um besser mit anderen Frinanzprodukten zu vergleichen.
;;
(define (average-yearly-return capital-after capital-before years)
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