Explanation:

- Let's assume A is 100.

- B is 10% more than A. So, B = 100 + 10 = 110.

- C is 20% less than A. So, C = 100 - 20 = 80.

- Now calculate what percentage B is more than C.

- The difference between B and C is 110 - 80 = 30.

- To find the percentage increase, use the formula: (Difference/Original value) x 100.

- Original value here is C, which is 80.

- So, (30/80) x 100 = 37.5%.

Option 3: 37.5% is correct.

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