The average expenditure of 32 persons is Rs.6,000 and that of another 40 persons is Rs. 3,300. The average expenditure of the whole group is:

Correct option is B

Total expenditure of the first group (32 persons)= 32×6,000=192,000
Total expenditure of the second group (40 persons)=40×3,300=132,000
Total expenditure of the whole group= 192,000+132,000=324,000
The total number of persons in the whole group= 32+40=72
Finally, the average expenditure of the whole group= $$\frac{324,000}{72}= 4500$$​
So, the average expenditure of the whole group = Rs. 4,500.