Profit - More than one Way!

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

fun revenue(g): 1.75 * g end

fun cost(g): 0.3 * g end

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

Khalil:

fun profit(g): (1.75 * g) - (0.3 * g) end

Samaria:

fun profit(g): (1.75 - 0.3) * g end

Alenka:

fun profit(g): 1.45 * g end

Fauzi:

fun profit(g): revenue(g) - cost(g) end

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?

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