Expenditure of company B in years 2003 and 2004 were in the ratio of 5 : 7 respectively. What was the respective ratio of their incomes?

Let expenditures of Company B in 2003 and 2004 are Rs. 5x and Rs. 7x respectively; then
their income in 2003, I₁= 5x + 40/100 x 5x = Rs. 7x
Also their income in 204, I₂ = 7x + 30/100 x 7x = Rs. 91x/10
Hence, the required ratio = 7x : 91x/10 = 10 : 13