A library has an average of 510 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:	A) 250	B) 276	C) 280	D) 285	E) 295

Rationale: "explanation : since the month begins with a sunday , to there will be five sundays in the month . required average = ( 510 × 5 + 240 × 25 / 30 ) = 8550 / 30 = 285 answer : d"
Answer: D