Question

	Total number of copies sold
End of $1^{st}$ week	$3200$
End of $2^{nd}$ week	$5500$
End of $3^{rd}$ week	$6800$
End of $4^{th}$ week	$7400$
End of $5^{th}$ 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 $3^{rd}$ week of its publication?

• A. $1200$
• B. $1250$
• C. $1300$
• D. $1350$

Answer 1

The correct option is C $1300$

To find the number of copies sold during the $3^{rd}$ week,

Number of copies sold by the end of $2^{nd}$ week $=$ $5500$

Number of copies sold by the end of $3^{rd}$ week $=$ $6800$

From above,

Number of copies sold during the $3^{rd}$ week $=$ (Number of copies sold by the end of $3^{rd}$ week) $-$ (Number of copies sold by the end of $2^{nd}$ week)

$=$ $6800$ $-$ $5500$

$=$ $1300$

Therefore, Number of copies sold during the $3^{rd}$ week is ${}^{\prime }{1300}^{\prime }$.