-50.25% is the change from 201 to 100
Calculation steps:
[( 100 - 201 ) ÷ 201] x 100 = -50.25%
Formula
Percentage change = [(100 - 201) / 201] x 100
Subtract the new number by the original number
100 - 201 = -101
-101 ÷ 201 = -0.5024875621890548
-0.5024875621890548 x 100 = -50.25%