-49% is the change from 200 to 102
Calculation steps:
[( 102 - 200 ) ÷ 200] x 100 = -49%
Formula
Percentage change = [(102 - 200) / 200] x 100
Subtract the new number by the original number
102 - 200 = -98
-98 ÷ 200 = -0.49
-0.49 x 100 = -49%
Example