Ahmed and Zoe were good friends who liked to build websites together for their friends for free. After about six months other people heard about them and Ahmed and Zoe began building websites charging money for them. Soon their business developed and they divided up the work - Ahmed designed the websites and Zoe looked after the business side of things.

After about six months of this practice, and in his spare time, Ahmed designed a complicated website for a friend. When he was finished his grateful friend paid Ahmed $5,000 and Ahmed deposited the money in his own bank account. Somehow Zoe found out about the payment and told Ahmed he should pay her half of the $5,000.

Is Zoe legally entitled to half of the $5,000? Why/why not?