1904.76% is the change from 21 to 421
Calculation steps:
[( 421 - 21 ) ÷ 21] x 100 = 1904.76%
Formula
Percentage change = [(421 - 21) / 21] x 100
Subtract the new number by the original number
421 - 21 = 400
400 ÷ 21 = 19.047619047619047
19.047619047619047 x 100 = 1904.76%