22.74% is the change from 343 to 421
Calculation steps:
[( 421 - 343 ) ÷ 343] x 100 = 22.74%
Formula
Percentage change = [(421 - 343) / 343] x 100
Subtract the new number by the original number
421 - 343 = 78
78 ÷ 343 = 0.22740524781341107
0.22740524781341107 x 100 = 22.74%