-63.86% is the change from 83 to 30
Calculation steps:
[( 30 - 83 ) ÷ 83] x 100 = -63.86%
Formula
Percentage change = [(30 - 83) / 83] x 100
Subtract the new number by the original number
30 - 83 = -53
-53 ÷ 83 = -0.6385542168674698
-0.6385542168674698 x 100 = -63.86%