The average income of 40 persons is 4200 and that of another 35 persons is 4000. The average income of the whole group is :

The average income of 40 persons is 4200 and that of another 35 pers

1.	The average income of 40 persons is 4200 and that of another 35 persons is 4000. The average income of the whole group is :
A.	4100
B.	<table><tr><td rowspan="2"> 4106</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">1</td></tr><tr><td style="text-align: center;">3</td></tr></table>
C.	<table><tr><td rowspan="2"> 4106</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">2</td></tr><tr><td style="text-align: center;">3</td></tr></table>
D.
E.	<table><tr><td rowspan="2"> 4108</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">1</td></tr><tr><td style="text-align: center;">3</td></tr></table>
Answer» D.

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The average income of 40 persons is 4200 and that of another 35 persons is 4000. The average income of the whole group is :

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