Cost of living in Grenoble (France) is 60% more expensive than in Abuja (Nigeria)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 368 prices entered by 32 different people.
For example, you would need at least 2,522,223 ₦ (€5,912) in Grenoble to maintain the same standard of living that you can have with 1,580,000 ₦ in Abuja.