-42.5% is the change from 280 to 161
Calculation steps:
[( 161 - 280 ) ÷ 280] x 100 = -42.5%
Formula
Percentage change = [(161 - 280) / 280] x 100
Subtract the new number by the original number
161 - 280 = -119
-119 ÷ 280 = -0.425
-0.425 x 100 = -42.5%