-24% is the change from 525 to 399
Calculation steps:
[( 399 - 525 ) ÷ 525] x 100 = -24%
Formula
Percentage change = [(399 - 525) / 525] x 100
Subtract the new number by the original number
399 - 525 = -126
-126 ÷ 525 = -0.24
-0.24 x 100 = -24%
Example