100% is the change from 439 to 878
Calculation steps:
[( 878 - 439 ) ÷ 439] x 100 = 100%
Formula
Percentage change = [(878 - 439) / 439] x 100
Subtract the new number by the original number
878 - 439 = 439
439 ÷ 439 = 1
1 x 100 = 100%
Example