Which approach to bidding is best suited to maximize profit?

  • Balance CPA and # of conversions
  • Minimize CPA
  • Maximize conversions
  • Maximize ROI as a percentage

The correct answer is:

  • Balance CPA and # of conversions

Explanation: If you want customers to take a direct action on your site, and you’re using conversion tracking, then it may be best to focus on conversions. Cost-per-acquisition (CPA) bidding lets you do that.

You can read more here: https://support.google.com/adwords/answer/2472725?hl=en