37.4% is the change from 639 to 878
Calculation steps:
[( 878 - 639 ) ÷ 639] x 100 = 37.4%
Formula
Percentage change = [(878 - 639) / 639] x 100
Subtract the new number by the original number
878 - 639 = 239
239 ÷ 639 = 0.37402190923317685
0.37402190923317685 x 100 = 37.4%