58.24% is the change from 340 to 538
Calculation steps:
[( 538 - 340 ) ÷ 340] x 100 = 58.24%
Formula
Percentage change = [(538 - 340) / 340] x 100
Subtract the new number by the original number
538 - 340 = 198
198 ÷ 340 = 0.5823529411764706
0.5823529411764706 x 100 = 58.24%