49.57% is the change from 345 to 516
Calculation steps:
[( 516 - 345 ) ÷ 345] x 100 = 49.57%
Formula
Percentage change = [(516 - 345) / 345] x 100
Subtract the new number by the original number
516 - 345 = 171
171 ÷ 345 = 0.4956521739130435
0.4956521739130435 x 100 = 49.57%