121.3% is the change from 399 to 883
Calculation steps:
[( 883 - 399 ) ÷ 399] x 100 = 121.3%
Formula
Percentage change = [(883 - 399) / 399] x 100
Subtract the new number by the original number
883 - 399 = 484
484 ÷ 399 = 1.213032581453634
1.213032581453634 x 100 = 121.3%