
Shortcut Trick
Let A2 = 1 unit.
A1 is 19 times more than A2 → A1 = 1 + 19 = 20 units.
Difference between A1 and A2 = 20 − 1 = 19 units.
Percentage less = (Difference / A1) × 100 = (19 / 20) × 100 = 19 × 5 = 95%.
∴ The correct answer is 95%.

Alternate Method
Given: A1 is 19 times more than A2.
Formula Used: Percentage Less = [(Higher Value − Lower Value) / Higher Value] × 100
A1 (20 units)
A2 (1 unit)
Difference = 19 units (95% of A1)
A2 is (19/20) × 100 = 95% less than A1
⇒ Let A2 = x
⇒ A1 = x + 19x (as A1 is 19 times 'more' than A2)
⇒ A1 = 20x
⇒ Difference = A1 − A2 = 20x − x = 19x
⇒ Required Percentage = (Difference / A1) × 100
⇒ Required Percentage = (19x / 20x) × 100
⇒ Required Percentage = 19 × 5 = 95%
∴ The correct answer is 95%.

Additional Information
Interpretation of More than vs As much as
If A is 'n' times more than B, then A = B + nB = (n+1)B. If A is 'n' times as much as B, then A = nB.
Percentage Change Rule
Percentage change = [|Initial − Final| / Reference Value] × 100. The denominator is always the value compared with (after 'than').
Standard Fraction Conversions
1/20 = 5%, 1/19 ≈ 5.26%, 1/21 ≈ 4.76%. These help in quickly solving percentage comparison questions.