50.58% is the change from 342 to 515
Calculation steps:
[( 515 - 342 ) ÷ 342] x 100 = 50.58%
Formula
Percentage change = [(515 - 342) / 342] x 100
Subtract the new number by the original number
515 - 342 = 173
173 ÷ 342 = 0.5058479532163743
0.5058479532163743 x 100 = 50.58%