[plt-scheme] HtDP > Chapter 2 > Exercise 2.3.3.

On Jun 26, 2008, at 3:30 PM, Mr. Watson wrote:

> Hello,
>
> The problem says,
>
> "An old-style movie theater has a simple profit function. Each
> customer pays $5 per ticket. Every performance costs the theater $20,
> plus $.50 per attendee. Develop the function total-profit. It consumes
> the number of attendees (of a show) and produces how much income the
> attendees produce."
>
> I understand the problem but I cannot get it to work (not calculate
> correctly) in DrScheme.
>
> Here is my working progress:
>
> (define(total-profit attendee)
>   (- 0
>    (- 20 0
>     (* 0.5 attendee)
>     (+ 0
>      (* 5 attendee)))))

Your work in progress doesn't seem to include the early steps of the  
design recipe, most notably the examples.  What are your examples?

All the best,

John Clements

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