Discussion

Explanation:

Let incomes of Amala, Bimala and Kamala be a, b and k respectively.

∴ a = 65 × b = 45 × k.

∴ kb = 32

Let Kamala's income be 300 and Bimala's income be 200.

∴ Kamala's new income = 300 × 0.96 = 288 and Bimla's new income = 200 × 1.1 = 220.   

∴ Required percentage = 288-220220 × 100 = 68220  × 100 = 30.9 ≈ 31%.

Hence, option (a).

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Doubts


Why did we took 0.96k to 1.1b ratio and subtraction of 1 from that?? said (2023-08-24 05:16:51)

How did we calculate percentage in last part?

Reply from Admin:

Solution update with more clarity.


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