1985.71% is the change from 21 to 438
Calculation steps:
[( 438 - 21 ) ÷ 21] x 100 = 1985.71%
Formula
Percentage change = [(438 - 21) / 21] x 100
Subtract the new number by the original number
438 - 21 = 417
417 ÷ 21 = 19.857142857142858
19.857142857142858 x 100 = 1985.71%