Tanzania's start-up entrepreneurs

On leaving university, graduates can often find it difficult to get a job. However, sometimes in Africa, the problem is especially stark.

In Nigeria, for example, it is thought that nearly a quarter of graduates are unemployed when they leave university. In Kenya, two-thirds of students feel they will be self-employed when they graduate.

And in Tanzania, many become entrepreneurs while still studying... as the BBC's Vumani Mkhize found out in the city of Dar es Salaam.