-79.31% is the change from 145 to 30
Calculation steps:
[( 30 - 145 ) ÷ 145] x 100 = -79.31%
Formula
Percentage change = [(30 - 145) / 145] x 100
Subtract the new number by the original number
30 - 145 = -115
-115 ÷ 145 = -0.7931034482758621
-0.7931034482758621 x 100 = -79.31%