34.17% is the change from 477 to 640
Calculation steps:
[( 640 - 477 ) ÷ 477] x 100 = 34.17%
Formula
Percentage change = [(640 - 477) / 477] x 100
Subtract the new number by the original number
640 - 477 = 163
163 ÷ 477 = 0.3417190775681342
0.3417190775681342 x 100 = 34.17%