-50% is the change from 536 to 268
Calculation steps:
[( 268 - 536 ) ÷ 536] x 100 = -50%
Formula
Percentage change = [(268 - 536) / 536] x 100
Subtract the new number by the original number
268 - 536 = -268
-268 ÷ 536 = -0.5
-0.5 x 100 = -50%
Example