120.55% is the change from 399 to 880
Calculation steps:
[( 880 - 399 ) ÷ 399] x 100 = 120.55%
Formula
Percentage change = [(880 - 399) / 399] x 100
Subtract the new number by the original number
880 - 399 = 481
481 ÷ 399 = 1.205513784461153
1.205513784461153 x 100 = 120.55%