1 12687dd9 2023-08-04 jrmu ;; The first three lines of this file were inserted by DrScheme. They record metadata
2 12687dd9 2023-08-04 jrmu ;; about the language level of this file in a form that our tools can easily process.
3 12687dd9 2023-08-04 jrmu #reader(lib "htdp-beginner-reader.ss" "lang")((modname |3.14|) (read-case-sensitive #t) (teachpacks ((lib "convert.ss" "teachpack" "htdp"))) (htdp-settings #8(#t constructor repeating-decimal #f #t none #f ((lib "convert.ss" "teachpack" "htdp")))))
4 12687dd9 2023-08-04 jrmu ;; profit : number -> number
5 12687dd9 2023-08-04 jrmu ;; Calculates profit as a difference between profit and revenue depending on the ticket-price
7 12687dd9 2023-08-04 jrmu (define (profit ticket-price)
8 12687dd9 2023-08-04 jrmu (- (revenue ticket-price) (costs ticket-price)))
10 12687dd9 2023-08-04 jrmu ;; revenue : number -> number
11 12687dd9 2023-08-04 jrmu ;; Calculates revenue, which is given as the ticket-price times the number of attendees.
13 12687dd9 2023-08-04 jrmu (define (revenue ticket-price)
14 12687dd9 2023-08-04 jrmu (* ticket-price (attendees ticket-price)))
16 12687dd9 2023-08-04 jrmu ;; costs : number -> number
17 12687dd9 2023-08-04 jrmu ;; Calculates costs, which has a fixed cost plus a variable cost that depends on the ticket-price
19 12687dd9 2023-08-04 jrmu (define (costs ticket-price)
20 12687dd9 2023-08-04 jrmu (* 1.50 (attendees ticket-price)))
22 12687dd9 2023-08-04 jrmu ;; attendees : number -> number
23 12687dd9 2023-08-04 jrmu ;; Calculates the number of attendees as a function of the ticket price
24 12687dd9 2023-08-04 jrmu ;; Example: (attendees 5) should give 120
25 12687dd9 2023-08-04 jrmu ;; Example: (attendees 4) should give 270
26 12687dd9 2023-08-04 jrmu ;; Example: (attendees 3) should give 420
28 12687dd9 2023-08-04 jrmu (define (attendees ticket-price)
29 12687dd9 2023-08-04 jrmu (+ 120 (* (/ (- 5 ticket-price) 0.1) 15)))
