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

 From: Mr. Watson (graphettion at gmail.com) Date: Thu Jun 26 18:30:43 EDT 2008 Previous message: [plt-scheme] IE Warnings Next message: [plt-scheme] HtDP > Chapter 2 > Exercise 2.3.3. Messages sorted by: [date] [thread] [subject] [author]

```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)))))

Any ideas on what I am doing wrong? I might be miscalculating so tell
me if its right.

Thank you,

```

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