-95% is the change from 600 to 30
Calculation steps:
[( 30 - 600 ) ÷ 600] x 100 = -95%
Formula
Percentage change = [(30 - 600) / 600] x 100
Subtract the new number by the original number
30 - 600 = -570
-570 ÷ 600 = -0.95
-0.95 x 100 = -95%
Example