A library has an average of 660 visitors on Sundays and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is:  Choose the correct choice from the following choices.
A) 250	B) 276	C) 280	D) 310	E) none

Rationale: "since the month begins with sunday , to there will be five sundays in the month average required = ( 660 x 5 + 240 x 25 ) / 30 ) = 310 answer : option d"
Answer: D