-80% is the change from 30 to 6
Calculation steps:
[( 6 - 30 ) ÷ 30] x 100 = -80%
Formula
Percentage change = [(6 - 30) / 30] x 100
Subtract the new number by the original number
6 - 30 = -24
-24 ÷ 30 = -0.8
-0.8 x 100 = -80%
Example