Average profit \(=\frac{Total\ profit}{Number\ of\ years}\)
\(=\frac{30,000+40,000+50,000+45,000}{3}\)
\(\frac{1,62,000}{4}\) = Rs. 40,500
Normal profit = Capital employed \(\times\) Normal rate of return
= 3,00,000 \(\times\) \(\frac{10}{100}\) = Rs. 30,000
Super profit = Average profit - Normal profit
= 40,500 - 30,000 = Rs. 10,500
Goodwill = \(\frac{super\ profit}{Normal\ rate\ of\ return}\)\(\times\) 100
= \(\frac{10,500}{10}\times100\) = Rs. 1,05,000

Super profit = Average profit - Normal profit
= 14,000 - 4,000 = Rs. 10,000
Goodwill = Super profit \(\times\) Value of annuity
= 14,000 \(\times\) 3.352
Goodwill = Rs. 33,520

Goodwill   = Super profit \(\times\) Number of years of purchase
Super profit = Average profit - Normal profit
Normal profit = Capital employed \(\times\) Normal rate of return
Capital employed = Fixed asset + Current assets - Current liabilities
 5,00,000 - 2,00,000 = Rs. 3,00,000
Normal profit = 3,00,000 x 12.5%
= Rs. 37,500
Super profit  = 60,000 - 37,500 = Rs. 22,500
Goodwill  = 22,500 \(\times\) 2
= Rs. 45,000

Capitalised value of the business = \(\frac{Average\ profit}{Normal\ rate\ of\ return}\times100\)
= \(\frac{20,000}{10}\times100\)
= Rs. 2,00,000
Capital employed = Fixed assets (excluding goodwill) + Current assets - Current Liabilities
Capital employed = Tangible assets of the firm - Liabilities of the firm
Net tangible assets = 2,20,000 - 70,000 = Rs. 1,50,000
Goodwill = Total capitalised value of the average profit - Capital employed
= 2,00,000 - 1,50,000
= Rs. 50,000

Average profit \(=\frac{Total\ profit}{Number\ of\ years}\)
\(=\frac{20,000+17,000+23,000}{3}\)
\(=\frac{60,000}{3}\) = Rs.20,000
Normal profit = Capital employed x Normal rate of return
80,000 \(\times\) 15% = Rs. 12,000
Super profit = Average profit - Normal profit
20,000 - 12,000 = Rs. 8,000
Goodwill = Super profit \(\times\) Number of years of purchase
= 8,000 \(\times\) 2 = Rs.16,000
Goodwill = Rs. 16,000