GAAP Publishing Co. is a wholesaler that sells accounting textbooks to colleges and universities. The company is preparing its budget for the fourth quarter of the year, i.e. October 1^st-December 31^st, and has collected the following information to assist in its budget preparation:

Month	Units	Revenues
October	2,300	$41,400
November	900	$16,200
December	4,200	$75,600
January	5,800	$104,400

GAAP Publishing likes to maintain month-end textbook inventory equal to 25% of the following months sales goal. GAAP had 575 textbooks in stock as of September 30^th. How many textbooks will the company anticipate purchasing during the fourth quarter?

7,400

8,275

8,850

6,825

I solved it but got a different choice when it's supposed to be 8,275. Please explain the process of getting that answer.