39.13% is the change from 345 to 480
Calculation steps:
[( 480 - 345 ) ÷ 345] x 100 = 39.13%
Formula
Percentage change = [(480 - 345) / 345] x 100
Subtract the new number by the original number
480 - 345 = 135
135 ÷ 345 = 0.391304347826087
0.391304347826087 x 100 = 39.13%