-27.52% is the change from 109 to 79
Calculation steps:
[( 79 - 109 ) ÷ 109] x 100 = -27.52%
Formula
Percentage change = [(79 - 109) / 109] x 100
Subtract the new number by the original number
79 - 109 = -30
-30 ÷ 109 = -0.27522935779816515
-0.27522935779816515 x 100 = -27.52%