A is 25% more than B, and B is 40% less than C. If C is 20% more than D, then A is what percentage less than D?

10%

Let D be 100x

So, C is 20% more than D

C = 100x + 100x × 20% = 120x

B is 40% less than C

B = 120x - 120x × 40% = 72x

A is 25% more than B

A = 72x + 72x × 25% = 90x

Required percentage = \(\frac{(100-72)}{100}\) × 100 = 10%