Stacey created a Google Display ads campaign and invested $1000 over a period of one month, during which time she saw 40 click-through conversions and 10 view-through conversions. What's the average CPA of Stacey's Display campaign, if she uses view-through conversions to get a more accurate picture of it's full value?

The provided answer key conflicts with Google Ads methodology. Average CPA is calculated by dividing total cost by total conversions, and Google defines view-through conversions as additional conversions that happen after an ad is viewed without a click. If the campaign spent $1,000 and produced 40 click-through conversions plus 10 view-through conversions, the total is 50 conversions. That makes the average CPA $20, not $25. Under official Google Ads terminology, the listed key is not aligned with the documented formula