Investment=Rs.19200Div%=15%
Nominal value of each share=Rs.100
Premium=20%
∴ Market value of each share=100+20% of 100=100+20100×100=Rs.120
No.of share=investmentM.Vofeachshare=19200120=160
∴Div on 1 share=15% of 100=15100×100=Rs.15
∴Dividend for the first year=15×160=Rs.2400
Since each share is sold for Rs.140
∴The proceeds(including dividend)=160×140+2400=Rs.24800
Now the sum invested=Rs.24800
Nominal value of each share=Rs.20
Market value of each share=Rs.16
Dividend=20%
∴No.of share brought=2480016=1550
Div. on 1 share=20% of 20=20100×20=Rs.4
∴Annual income in second year=1550×4=Rs.6200
Since increase in return=6200−2400=Rs.3800
∴percentage change in return=380019200×100=19.792%