Let the value of C be 100x ⇒ B = 125% × C ⇒ B = 125x ⇒ A = 120% × B ⇒ A = 120% × 125x ⇒ A = 150x ⇒ C is less than A = 150x – 100x = 50x ⇒ Required % =
50x
150x
×100 =33.33% ∴ C is 33.33% less than A. Alternate Method Let B be 100, A is 20% more than B, ⇒ A = 120% of B ⇒ A = 120/100 × 100 = 120 B is 25% more than C ⇒ B = 125% of C ⇒ C = B × 100/125 ⇒ C = 100 × 100/125 = 80 C is lesser than A by, ⇒ 120 – 80 = 40 In percentage, ⇒ 40/120 × 100 ⇒ 33.33% ∴ C is 33.33% less than A.