There was nothing wobbly about The Jelly Crew's business plan for Cumberland High School's market stall day.
The year 11 students aimed to turn a profit selling rainbow jelly cups for $1 at the second annual stall day on Friday.
Year 9 commerce and year 11 economics students set up a business, with their mostly food and drink items retailing for up to $5 at the lunchtime event.
Only one group chose not to make a product, opting for a game, Can You Win It?
For the game, peers and teachers payed to try to throw a table tennis ball into one of a flat pyramid of plastic cups to win chocolates or lollies.
HSIE teacher Leanne Carroll said the groups were peer-assessed by students in the grade above them and by external business mentors.
"In the past we've done hypothetical businesses but this year we decided to make it real," she said.
"When we're talking about marketing and operations, and finance and human resources we keep relating it back to their business. I feel like it connects people a lot more [to the concepts].
"Everyone was excited."
Ms Carroll said the markers looked for several things in a successful business when assessing the 23 stalls.
"They were looking for presentation, organisation, how well they worked as a group, what their customer service skills were like."
Year 11 student Georgia McPherson, 16, said the groups were advised to set a target market and to be creative.
"You could do whatever you wanted to but food was an obvious option for people at school," she said.
There were yoghurt and fruit stalls, chocolate brownies, and iced vanilla, lemon and chocolate cupcakes among the sweet options. Yummy offered a combo deal of chicken noodles with a meatball and tropical drink.
Georgia Bradberry, 16, said she chose economics because it seemed practical.
"There was the whole build-up of planning what we were going to buy and surveying people," she said.
Teams built their businesses over a school term and wrote reports on their sustainability, cash flow and management.