Oxfam said the figures show the extreme inequality in Nigeria, Africa's second-biggest economy.
Aliko Dangote, a Nigerian cement magnate, is a big fan of the London club.
A pest has wiped out 80 percent of tomato farms in one state, but Lai Mohammed says the militant group is to blame.
Former South African President Thabo Mbeki says that $50 billion leaves Africa illicitly each year.
The Nigerian commodities billionaire has been linked to at least four offshore shell companies.