-45% is the change from 280 to 154
Calculation steps:
[( 154 - 280 ) ÷ 280] x 100 = -45%
Formula
Percentage change = [(154 - 280) / 280] x 100
Subtract the new number by the original number
154 - 280 = -126
-126 ÷ 280 = -0.45
-0.45 x 100 = -45%
Example