52.58% is the change from 639 to 975
Calculation steps:
[( 975 - 639 ) ÷ 639] x 100 = 52.58%
Formula
Percentage change = [(975 - 639) / 639] x 100
Subtract the new number by the original number
975 - 639 = 336
336 ÷ 639 = 0.5258215962441315
0.5258215962441315 x 100 = 52.58%
Example