-50% is the change from 522 to 261
Calculation steps:
[( 261 - 522 ) ÷ 522] x 100 = -50%
Formula
Percentage change = [(261 - 522) / 522] x 100
Subtract the new number by the original number
261 - 522 = -261
-261 ÷ 522 = -0.5
-0.5 x 100 = -50%
Example