Your average bid is US$10 and you’ve enabled enhanced cost-per-click bidding (ECPC). Assuming you haven’t set any bid adjustments, ECPC can raise your bid to which amount when AdWords sees an auction that’s more likely to lead to a sale?
ECPC looks for ad auctions that are more likely to lead to sales, and then raises your Max. CPC bid up to 30% (after applying any bid adjustments that you’ve set) to compete harder for those clicks. If a click seems less likely to convert, then AdWords will lower your bid by as much as 100%.