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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;
Let x be the average daily revenue for the last 4 days. Using the formula
，the information regarding the average revenues for the 10-day and 6-day periods can be expressed as follows and solved for x:
The correct answer is D.
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