- Option : D
- Explanation : Let C’s income = 100

B’s income = 100 + 20 = 120

A’s income = 125% of 120 = 150

Thus, A’s income is 50% higher than that of C.

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- Option : C
- Explanation : Let cost price = 100

Net selling price = 100 + 8 = 108

Now 120 – (x% of 120) = 108

x = 10

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- Option : C
- Explanation : Suppose both length and breadth are 100.

Hence, area = 100 × 100

New length = 100 + 10 m = 110

As area is to be kept same,

110 × new breadth = 100 × 100

New breadth = 100 × 100/110 = 1000/11

Decrease in breadth = 100 − 1,000/11 = 100/11 = 9.11%

As breadth was assumed to be 100, no additional calculation is required for percentage figure.

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- Option : B
- Explanation : Using the formula: x + y + xy/100, net percentage increase = 20 + 40 + (20 × 40)/100 = 68%

Increased price = Rs 25 + 68% of 25 = 25 + 17 = Rs 42

Alternatively: Using the multiplier factor concept, we get the final price as 25 ×[6/5]x[7/5]=Rs 42

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