It depends on the products. Some categories are more than others and some categories are capped. For example, I sell laptops on on of my sites, but the commission is capped at $25. In general, the range is 4% to 8%.
If you scroll down on that page a bit further you'll see that as your sales volume goes up the commission rate increases. https://affiliate-program.amazon.com/gp/associates/help/t2/a15
Most rates start at 4% and move up as the number of products sold increase. That said, various products have different commission, so it's worth checking their site for full listings. Good luck.