39.77% is the change from 342 to 478
Calculation steps:
[( 478 - 342 ) ÷ 342] x 100 = 39.77%
Formula
Percentage change = [(478 - 342) / 342] x 100
Subtract the new number by the original number
478 - 342 = 136
136 ÷ 342 = 0.39766081871345027
0.39766081871345027 x 100 = 39.77%