I've been hearing a lot about basic income lately. What I wonder is: how much should a person receive? e.g. if a competent, competitive person receives X per y

I've been hearing a lot about basic income lately. What I wonder is: how much should a person receive? e.g. if a competent, competitive person receives X per year, should basic income be 0.1X, 0.25X, 0.90X, etc? Also, would competent people working remotely from a different country be taxed to contribute to the basic income fund?