-22.55% is the change from 102 to 79
Calculation steps:
[( 79 - 102 ) ÷ 102] x 100 = -22.55%
Formula
Percentage change = [(79 - 102) / 102] x 100
Subtract the new number by the original number
79 - 102 = -23
-23 ÷ 102 = -0.22549019607843138
-0.22549019607843138 x 100 = -22.55%