-11.39% is the change from 79 to 70
Calculation steps:
[( 70 - 79 ) ÷ 79] x 100 = -11.39%
Formula
Percentage change = [(70 - 79) / 79] x 100
Subtract the new number by the original number
70 - 79 = -9
-9 ÷ 79 = -0.11392405063291139
-0.11392405063291139 x 100 = -11.39%