Four students defined the same revenue and cost functions, shown below:

(define (revenue g) (* 1.75 g))

(define (cost g) (* 0.3 g))

However, they came up with four different definitions for profit:

Khalil:

(define (profit g) (- (* 1.75 g) (* 0.3 g)))

Samaria:

(define (profit g) (* (- 1.75 0.3) g))

Alenka:

(define (profit g) (* 1.45 g))

Fauzi:

(define (profit g) (- (revenue g) (cost g)))

1 Which of these four definitions do you think is "best", and why?

2 If lemons get more expensive, which definitions of profit need to be changed?

3 If Sally raises her prices, which definitions of profit need to be changed?

4 Which definition of profit is the most flexible? Why?

These materials were developed partly through support of the National Science Foundation, (awards 1042210, 1535276, 1648684, and 1738598). CCbadge Bootstrap by the Bootstrap Community is licensed under a Creative Commons 4.0 Unported License. This license does not grant permission to run training or professional development. Offering training or professional development with materials substantially derived from Bootstrap must be approved in writing by a Bootstrap Director. Permissions beyond the scope of this license, such as to run training, may be available by contacting contact@BootstrapWorld.org.