39.75% is the change from 639 to 893
Calculation steps:
[( 893 - 639 ) ÷ 639] x 100 = 39.75%
Formula
Percentage change = [(893 - 639) / 639] x 100
Subtract the new number by the original number
893 - 639 = 254
254 ÷ 639 = 0.3974960876369327
0.3974960876369327 x 100 = 39.75%