The mean income of I group of persons is Rs. 400 II group of persons has mean income Rs. 480. If the mean income of all 160 persons in the two groups together is Rs. 430, then the number of person in the II group is
A
100
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B
50
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C
60
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D
None of these
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Solution
The correct option is C60
The mean income of group of person is Rs. 400
II group=480, if the mean income of all 160 person in the two groups is Rs. 430, then the no of person group II is?