-27.85% is the change from 79 to 57
Calculation steps:
[( 57 - 79 ) ÷ 79] x 100 = -27.85%
Formula
Percentage change = [(57 - 79) / 79] x 100
Subtract the new number by the original number
57 - 79 = -22
-22 ÷ 79 = -0.27848101265822783
-0.27848101265822783 x 100 = -27.85%