4614.29% is the change from 21 to 990
Calculation steps:
[( 990 - 21 ) ÷ 21] x 100 = 4614.29%
Formula
Percentage change = [(990 - 21) / 21] x 100
Subtract the new number by the original number
990 - 21 = 969
969 ÷ 21 = 46.142857142857146
46.142857142857146 x 100 = 4614.29%