255% is the change from 280 to 994
Calculation steps:
[( 994 - 280 ) ÷ 280] x 100 = 255%
Formula
Percentage change = [(994 - 280) / 280] x 100
Subtract the new number by the original number
994 - 280 = 714
714 ÷ 280 = 2.55
2.55 x 100 = 255%
Example