22.45% is the change from 343 to 420
Calculation steps:
[( 420 - 343 ) ÷ 343] x 100 = 22.45%
Formula
Percentage change = [(420 - 343) / 343] x 100
Subtract the new number by the original number
420 - 343 = 77
77 ÷ 343 = 0.22448979591836735
0.22448979591836735 x 100 = 22.45%