How much does a person need to travel from Ghama to US to prove they have sufficient funds to live on here in the US
closed as too broad by Itai, bytebuster, Giorgio, Karlson, Traveller Feb 18 at 3:14
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This sounds very much like, I'm afraid, yet another variation on an unfortunately common scam. To answer your question: There is no definite amount; it depends on the duration of the person's visit and the specific activities anticipated during the visit.
Scammers commonly claim that they need a certain amount of money before they can get a visa, or to purchase a plane ticket, or some other prerequisite to their travel. They also frequently claim to be traveling from one of a small number of countries, prominently including Ghana and Russia.
Adding to phoog's answer about how much money: in addition to having funds to pay for the trip (and spending most or all of one's savings for a brief vacation will alone be disqualifying), the applicant (assuming that a diplomatic, dual-intent, or immigrant visa isn't sought) must rebut the US-legally-imposed presumption that visa seekers have immigrant intent. This requires showing reasons why the applicant would return home after the trip: spouse, children, other family, property, other savings or assets, job, etc.
Without proof to rebut the presumption, the visa application will be denied.