Davido reveals he made half a billion on his 30 Billion Concert

Davido reveals he made 'half a billi' on his Lagos concert, 30 Billion Concert, last year December. Davido revealed this on Snapchat but never mentioned what currency that is. See below:
  

A post shared by Absolute Hearts Media (@absolutehearts) on Jan 9, 2018 at 9:19am PST