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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