-80% is the change from 70 to 14
Calculation steps:
[( 14 - 70 ) ÷ 70] x 100 = -80%
Formula
Percentage change = [(14 - 70) / 70] x 100
Subtract the new number by the original number
14 - 70 = -56
-56 ÷ 70 = -0.8
-0.8 x 100 = -80%
Example