-40.88% is the change from 521 to 308
Calculation steps:
[( 308 - 521 ) ÷ 521] x 100 = -40.88%
Formula
Percentage change = [(308 - 521) / 521] x 100
Subtract the new number by the original number
308 - 521 = -213
-213 ÷ 521 = -0.4088291746641075
-0.4088291746641075 x 100 = -40.88%