I remember a similar exercise my daughters did in Jr. High. They were given a budget and a list of things that are pretty standard for life in the modern USA. It was an almost real-life lesson in budgeting for them, and I was glad it was a part of the curriculum. At least something resembling budgeting was being taught.
I found it interesting the way the two approached the lesson. Elder daughter took her (small) budget and squeezed each penny 'til it turned blue. She had problems spending it all, actually, and the teacher insisted that all the money be spent. The other daughter had the reverse problem, running out of money far before she had everything - of course, the muscle car had something to do with that. :rolleyes:
I'd say don't sweat this. No matter what else, your child will probably learn that money spends faster than you think it will - unless she's like my elder daughter.