49.28% is the change from 345 to 515
Calculation steps:
[( 515 - 345 ) ÷ 345] x 100 = 49.28%
Formula
Percentage change = [(515 - 345) / 345] x 100
Subtract the new number by the original number
515 - 345 = 170
170 ÷ 345 = 0.4927536231884058
0.4927536231884058 x 100 = 49.28%