51.47% is the change from 340 to 515
Calculation steps:
[( 515 - 340 ) ÷ 340] x 100 = 51.47%
Formula
Percentage change = [(515 - 340) / 340] x 100
Subtract the new number by the original number
515 - 340 = 175
175 ÷ 340 = 0.5147058823529411
0.5147058823529411 x 100 = 51.47%