39.9% is the change from 421 to 589
Calculation steps:
[( 589 - 421 ) ÷ 421] x 100 = 39.9%
Formula
Percentage change = [(589 - 421) / 421] x 100
Subtract the new number by the original number
589 - 421 = 168
168 ÷ 421 = 0.3990498812351544
0.3990498812351544 x 100 = 39.9%