-95.45% is the change from 660 to 30
Calculation steps:
[( 30 - 660 ) ÷ 660] x 100 = -95.45%
Formula
Percentage change = [(30 - 660) / 660] x 100
Subtract the new number by the original number
30 - 660 = -630
-630 ÷ 660 = -0.9545454545454546
-0.9545454545454546 x 100 = -95.45%