53.13% is the change from 638 to 977
Calculation steps:
[( 977 - 638 ) ÷ 638] x 100 = 53.13%
Formula
Percentage change = [(977 - 638) / 638] x 100
Subtract the new number by the original number
977 - 638 = 339
339 ÷ 638 = 0.5313479623824452
0.5313479623824452 x 100 = 53.13%