1950% is the change from 20 to 410
Calculation steps:
[( 410 - 20 ) ÷ 20] x 100 = 1950%
Formula
Percentage change = [(410 - 20) / 20] x 100
Subtract the new number by the original number
410 - 20 = 390
390 ÷ 20 = 19.5
19.5 x 100 = 1950%
Example