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Question

Total number of copies sold
End of 1st week 3200
End of 2nd week 5500
End of 3rd week 6800
End of 4th week 7400
End of 5th week 7700
The table above shows the total number of copies of Book B that were sold by the end of each of the first 5 weeks of its publication. How many copies of the book were sold during the 3rd week of its publication?

A
1200
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B
1250
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C
1300
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D
1350
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Solution

The correct option is C 1300
To find the number of copies sold during the 3rd week,

Number of copies sold by the end of 2nd week = 5500
Number of copies sold by the end of 3rd week = 6800
From above,
Number of copies sold during the 3rd week = (Number of copies sold by the end of 3rd week) (Number of copies sold by the end of 2nd week)
= 6800 5500
= 1300

Therefore, Number of copies sold during the 3rd week is 1300.

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