Average profit is calculated by taking the sum of profits of the last 4 years and dividing by 4.
Total profit of 4 years = Rs. 80,000 + Rs. 1,40,000 + Rs. 2,00,000 + Rs. 1,60,000 = Rs. 5,80,000
Average profit = 4Total profit of 4 years = 45,80,000 = Rs. 1,45,000
Goodwill is valued at 3 years' purchase of average profit.
Goodwill = Average profit × Number of years' purchase
Goodwill = Rs. 1,45,000 × 3 = Rs. 4,35,000
The goodwill of the reconstituted firm is Rs. 4,35,000.