A library has an average of 480 visitors on Sundays and 210 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is

A library has an average of 480 visitors on Sundays and 210 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is
1). 245
2). 255
3). 274
4). 280

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