-73.91% is the change from 115 to 30
Calculation steps:
[( 30 - 115 ) ÷ 115] x 100 = -73.91%
Formula
Percentage change = [(30 - 115) / 115] x 100
Subtract the new number by the original number
30 - 115 = -85
-85 ÷ 115 = -0.7391304347826086
-0.7391304347826086 x 100 = -73.91%