50.29% is the change from 340 to 511
Calculation steps:
[( 511 - 340 ) ÷ 340] x 100 = 50.29%
Formula
Percentage change = [(511 - 340) / 340] x 100
Subtract the new number by the original number
511 - 340 = 171
171 ÷ 340 = 0.5029411764705882
0.5029411764705882 x 100 = 50.29%