113.03% is the change from 399 to 850
Calculation steps:
[( 850 - 399 ) ÷ 399] x 100 = 113.03%
Formula
Percentage change = [(850 - 399) / 399] x 100
Subtract the new number by the original number
850 - 399 = 451
451 ÷ 399 = 1.1303258145363408
1.1303258145363408 x 100 = 113.03%