-77.78% is the change from 135 to 30
Calculation steps:
[( 30 - 135 ) ÷ 135] x 100 = -77.78%
Formula
Percentage change = [(30 - 135) / 135] x 100
Subtract the new number by the original number
30 - 135 = -105
-105 ÷ 135 = -0.7777777777777778
-0.7777777777777778 x 100 = -77.78%