I never design book covers without, first, reading the book. The cover needs to accurately complement the personality of what’s inside, so without that insight most any critique (including my own) will be based on assumptions that might or might not be accurate.
To me, the book cover doesn’t convey a sense of Africa. Yes, the continent of Africa is there, so there’s no mistaking the African connection, but there’s no African personality in it — no color, no vibrancy and none of the diversity that’s associated with Africa. Then again, the original poster’s IP address originates from Nigeria and I’ve never been there, so who am I to say what’s appropriate in Nigeria?
I agree with @Steve_O that there’s a cut-and-paste quality to the cover. There’s a basic, rather stark outline of Africa with cut-and-paste gold coins spilling out of the middle. As Steve said, the train of thought isn’t bad, but the execution is too basic and lacks needed subtlety and finesse.
As other have said, there’s sort of a get-rich-quick look to the cover where accumulating treasure and gold is stressed over economic development, good business principles and general prosperity. Of course, never having read the book, maybe the book really is more of a how-to book about get-rich-quick schemes than one about building lasting wealth.