Correct Answer - Option 1 : Rs.13286
Total salary of the group = Rs.1,05,000
The income of each person in the group is same (7 persons)
∴ Income of each person = 105000/7 = Rs.15,000
4 persons donated 20% of their income to charity
∴ Amount donated in charity = 15,000 × (20/100) × 4 = Rs.12000
∴ Total income of the group = 1,05,000 – 12,000 = Rs.93000
Average income of the group = 93000/7 = Rs.13286
∴ Average income of the group is Rs.13286