CPA bidding method is the best when you want to notify the amount of money willing to pay for a conversion. CPA will reach the customers who are likely to convert. The types of CPA bidding are:

Target CPA, where the average amount willing to pay for a conversion and maximum CPA, maximum amount willing to pay for a conversion. Get acquainted with PPC training224 and you can easily get through the interview very easily.

It should be done through Click Through Rate (CTR). CTR is the rate at which PPC ads are being clicked. The formula is given as:-

Click-Through Rate = total clicks on Ad/total impressions.