Problem: On Saturday, Abena sees her neighbor, kojo, at a shopping mall. Abena knows very well that Kojo is in busieness opersting a special bus shuttle service to the airport. The shuttle services use an air-conditioned bus complete with music video facilities and breakfast.
Abena is travelling abroad. Abena asks Kojo if Kojo can drive her to the airport the following Monday.
On the monday, Kojo drives Abena to the airport and upon arriving there Abena promises to pay kojo 120 GHc upon her return from abroad. Can Kojo enforce Abena's promise?