29.94% is the change from 324 to 421
Calculation steps:
[( 421 - 324 ) ÷ 324] x 100 = 29.94%
Formula
Percentage change = [(421 - 324) / 324] x 100
Subtract the new number by the original number
421 - 324 = 97
97 ÷ 324 = 0.2993827160493827
0.2993827160493827 x 100 = 29.94%