125.56% is the change from 399 to 900
Calculation steps:
[( 900 - 399 ) ÷ 399] x 100 = 125.56%
Formula
Percentage change = [(900 - 399) / 399] x 100
Subtract the new number by the original number
900 - 399 = 501
501 ÷ 399 = 1.255639097744361
1.255639097744361 x 100 = 125.56%