-30% is the change from 80 to 56
Calculation steps:
[( 56 - 80 ) ÷ 80] x 100 = -30%
Formula
Percentage change = [(56 - 80) / 80] x 100
Subtract the new number by the original number
56 - 80 = -24
-24 ÷ 80 = -0.3
-0.3 x 100 = -30%
Example