22.38% is the change from 344 to 421
Calculation steps:
[( 421 - 344 ) ÷ 344] x 100 = 22.38%
Formula
Percentage change = [(421 - 344) / 344] x 100
Subtract the new number by the original number
421 - 344 = 77
77 ÷ 344 = 0.2238372093023256
0.2238372093023256 x 100 = 22.38%