A library has an average of 400 books on Sundays and 240 on other days. The average number of books per day in a month of 30 days beginning with a Sunday is?	Choose the correct choice.
A) 50
B) 55.5
C) 65
D) 75.5
E) 78.5
Since the month begins with a Sunday, to there will be five Sundays in the month.   Required average   = (400 x 5 + 240 x 25)/30   =	8550   30   = 75.5   75.5
<result>D</result>
A library has an average of 400 books on Sundays and 240 on other days. The average number of books per day in a month of 30 days beginning with a Sunday is?