258.7% is the change from 276 to 990
Calculation steps:
[( 990 - 276 ) ÷ 276] x 100 = 258.7%
Formula
Percentage change = [(990 - 276) / 276] x 100
Subtract the new number by the original number
990 - 276 = 714
714 ÷ 276 = 2.5869565217391304
2.5869565217391304 x 100 = 258.7%