Question

Which digital metric helps evaluate cost efficiency of online advertising?

A Impressions Correct Answer Incorrect Answer
B Conversion rate Correct Answer Incorrect Answer
C Cost per acquisition (CPA) Correct Answer Incorrect Answer
D Reach Correct Answer Incorrect Answer
E Brand recall Correct Answer Incorrect Answer

Solution

CPA measures cost required to acquire one customer, directly reflecting campaign cost efficiency.  Why Other Options Are Incorrect • A: Exposure only. • B: Percentage success, not cost. • D: Audience size. • E: Awareness metric.  Banking Example: Total ad spend ÷ number of approved loan customers.

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