19.56% is the change from 639 to 764
Calculation steps:
[( 764 - 639 ) ÷ 639] x 100 = 19.56%
Formula
Percentage change = [(764 - 639) / 639] x 100
Subtract the new number by the original number
764 - 639 = 125
125 ÷ 639 = 0.19561815336463223
0.19561815336463223 x 100 = 19.56%