-80% is the change from 80 to 16
Calculation steps:
[( 16 - 80 ) ÷ 80] x 100 = -80%
Formula
Percentage change = [(16 - 80) / 80] x 100
Subtract the new number by the original number
16 - 80 = -64
-64 ÷ 80 = -0.8
-0.8 x 100 = -80%
Example