4257.14% is the change from 21 to 915
Calculation steps:
[( 915 - 21 ) ÷ 21] x 100 = 4257.14%
Formula
Percentage change = [(915 - 21) / 21] x 100
Subtract the new number by the original number
915 - 21 = 894
894 ÷ 21 = 42.57142857142857
42.57142857142857 x 100 = 4257.14%