22.81% is the change from 342 to 420
Calculation steps:
[( 420 - 342 ) ÷ 342] x 100 = 22.81%
Formula
Percentage change = [(420 - 342) / 342] x 100
Subtract the new number by the original number
420 - 342 = 78
78 ÷ 342 = 0.22807017543859648
0.22807017543859648 x 100 = 22.81%