288.72% is the change from 257 to 999
Calculation steps:
[( 999 - 257 ) ÷ 257] x 100 = 288.72%
Formula
Percentage change = [(999 - 257) / 257] x 100
Subtract the new number by the original number
999 - 257 = 742
742 ÷ 257 = 2.88715953307393
2.88715953307393 x 100 = 288.72%