39.47% is the change from 342 to 477
Calculation steps:
[( 477 - 342 ) ÷ 342] x 100 = 39.47%
Formula
Percentage change = [(477 - 342) / 342] x 100
Subtract the new number by the original number
477 - 342 = 135
135 ÷ 342 = 0.39473684210526316
0.39473684210526316 x 100 = 39.47%