-80% is the change from 280 to 56
Calculation steps:
[( 56 - 280 ) ÷ 280] x 100 = -80%
Formula
Percentage change = [(56 - 280) / 280] x 100
Subtract the new number by the original number
56 - 280 = -224
-224 ÷ 280 = -0.8
-0.8 x 100 = -80%
Example