Based on Will I be taxed for accepting money to help needy?, I am wondering how the law goes.
Suppose a kid is taking part in a school activity (e.g. http://www.firstlegoleague.org) along with a team of 5-6 other kids and then there are expenses that all kids share equally. The total cost is $500 and there are 5 kids, and four of the kids pay $100 each to fifth kid's parent, who later does the purchasing of kits etc for $500., without taking a single dime as profit.
Is this collection of $400 from other kids taxable?