1914.29% is the change from 21 to 423
Calculation steps:
[( 423 - 21 ) ÷ 21] x 100 = 1914.29%
Formula
Percentage change = [(423 - 21) / 21] x 100
Subtract the new number by the original number
423 - 21 = 402
402 ÷ 21 = 19.142857142857142
19.142857142857142 x 100 = 1914.29%