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Explanation:

Let Ranita's income be R and that of Bhaskar be B.

Given, 40% of R = 56% of B
⇒ 0.4R = 0.56B
⇒ R : B = 0.56 : 0.4 = 56 : 40 = 7 : 5

∴ R = 7x and B = 5x

Now, given:

(R + 800) : (B + 2000) = 4 : 3
⇒ 3(7x + 800) = 4(5x + 2000)
⇒ 21x + 2400 = 20x + 8000
⇒ x = 5600

∴ Combined income of R and B = 7x + 5x = 12x = 12 × 5600 = Rs. 67,200

Hence, option (a).

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