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%

25% = \(\frac{1}{4}\)

40% = \(\frac{2}{5}\)

20% = \(\frac{1}{5}\)

                A     :     D

25% ⇒     5     :     4     

40% ⇒     3     :     5

20% ⇒     6     :     5    

   5 × 3 × 6     :     4 × 5 × 5

           9          :          10           = 1 (difference)                       

A is = \(\frac{1}{10}\) × 100 = 10 % less than D.