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In a small snack shop, the average (arithmetic mean) revenue was $400 per day over a 10‐ day period. During this period, if the average daily revenue was $360 for the first 6 days, what was the average daily revenue for the last 4 days?

    A. $420


    B. $440


    C. $450


    D. $460


    E. $480

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答案:
D

Arithmetic;

Algebra Statistics; Applied Problems

Let x be the average daily revenue for the last 4 days. Using the formulaimage.png,the information regarding the average revenues for the 10-day and 6-day periods can be expressed as follows and solved for x:

image.png

The correct answer is D.

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