If the amount invested by the two companies in 2005 were equal, what was the ratio of the total income of Company A to that of B on 2005?

Answer: Option C

Let the investment of each in 2005 be Rs. $$x$$
Then,
(Income of A) : (Income of B)
  = Rs. ($$x$$ + 70% of $$x$$) : Rs. ($$x$$ + 55% of $$x$$) [∵ Income = (Investment) + (Profit)]
$$\begin{array}{rl}& =\left(x+\frac{70x}{100}\right):\left(x+\frac{55x}{100}\right)\\ & =\left(x+\frac{7x}{10}\right):\left(x+\frac{11x}{20}\right)\\ & =\frac{17x}{10}:\frac{31x}{20}\\ & =34:31\end{array}$$