In a small snack shop, the average (arithmetic mean) revenue was $400 p e r d a y o v e r a 10 - d a y p e r i o d . D u r i n g t h i s p e r i o d, i f t h e a v e r a g e d a i l y r e v e n u e w a s$ 360 for the first 6 days, what was the average daily revenue for the last 4 days?

$ 420

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$ 440

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$ 450

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$ 460

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$ 480

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Solution

The correct option is E $ 460
For the 10-day period,
The total revenue was \ 400 \times 10 = $4000$
For the first 6 days,
Revenue was
\ 360 \times 6 = $2160$
So, the revenue for the last 4 days must be $4000 - 2160 =$ \ 1840 $
So, the average daily revenue for this 4 day period must be
\ 1840 / 4 = $460$ (option D)

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