-84.21% is the change from 190 to 30
Calculation steps:
[( 30 - 190 ) ÷ 190] x 100 = -84.21%
Formula
Percentage change = [(30 - 190) / 190] x 100
Subtract the new number by the original number
30 - 190 = -160
-160 ÷ 190 = -0.8421052631578947
-0.8421052631578947 x 100 = -84.21%