-95% is the change from 200 to 10
Calculation steps:
[( 10 - 200 ) ÷ 200] x 100 = -95%
Formula
Percentage change = [(10 - 200) / 200] x 100
Subtract the new number by the original number
10 - 200 = -190
-190 ÷ 200 = -0.95
-0.95 x 100 = -95%
Example