Money invested by Rajan before 1 year was =Rs. 100000
Money in UK pounds at 75 is =10000075=1333.33 Pounds
Now, after 1 year invested amount was appreciated by 20%
⇒20% of 1333.33=20100×1333.33=266.66
Total investment becomes =1333.33+266.66=1600 Pounds
This 1600 Pounds at Indian currency at 80=1600×80= Rs.1,28,000
Hence, Rajan's investment of Rs.1,00,000 becomes Rs.1,28,000 in 1 year
Therefore, his profit %=[(128000−100000)100000]×100=28%