-50.5% is the change from 202 to 100
Calculation steps:
[( 100 - 202 ) ÷ 202] x 100 = -50.5%
Formula
Percentage change = [(100 - 202) / 202] x 100
Subtract the new number by the original number
100 - 202 = -102
-102 ÷ 202 = -0.504950495049505
-0.504950495049505 x 100 = -50.5%