284.23% is the change from 260 to 999
Calculation steps:
[( 999 - 260 ) ÷ 260] x 100 = 284.23%
Formula
Percentage change = [(999 - 260) / 260] x 100
Subtract the new number by the original number
999 - 260 = 739
739 ÷ 260 = 2.8423076923076924
2.8423076923076924 x 100 = 284.23%