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So if staked such amount, will the person be receiving APR?

Yep, 3.00% APR, but if the inversor vote frequently, the %APR will can be 8.00% aprox.

That is powerful. Meaning that the stake will be inside the person's wallet right? I thought the person will delegate to whales only to receive 3%APR. Also, the APR, will it be weekly, daily, monthly or yearly?

Yes, inside the person's wallet. Nope, 3% if is stake return and the growth very superior, if the person vote. And the APR (Annual Percentage Rate) is, well, annual..!