57.1% is the change from 345 to 542
Calculation steps:
[( 542 - 345 ) ÷ 345] x 100 = 57.1%
Formula
Percentage change = [(542 - 345) / 345] x 100
Subtract the new number by the original number
542 - 345 = 197
197 ÷ 345 = 0.5710144927536231
0.5710144927536231 x 100 = 57.1%