The average income of 40 persons is 4200 Rs. and that of an other 35 persons is 4000 Rs. The average income of the whole group is :
[A] 4108 \frac{1}{3}Rs.
[B] 4106 \frac{2}{3}Rs.
[C] 4100 Rs.
[D] 4106 \frac{1}{3}Rs.
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