21.68% is the change from 346 to 421
Calculation steps:
[( 421 - 346 ) ÷ 346] x 100 = 21.68%
Formula
Percentage change = [(421 - 346) / 346] x 100
Subtract the new number by the original number
421 - 346 = 75
75 ÷ 346 = 0.21676300578034682
0.21676300578034682 x 100 = 21.68%