-91.57% is the change from 83 to 7
Calculation steps:
[( 7 - 83 ) ÷ 83] x 100 = -91.57%
Formula
Percentage change = [(7 - 83) / 83] x 100
Subtract the new number by the original number
7 - 83 = -76
-76 ÷ 83 = -0.9156626506024096
-0.9156626506024096 x 100 = -91.57%