-7.68% is the change from 521 to 481
Calculation steps:
[( 481 - 521 ) ÷ 521] x 100 = -7.68%
Formula
Percentage change = [(481 - 521) / 521] x 100
Subtract the new number by the original number
481 - 521 = -40
-40 ÷ 521 = -0.07677543186180422
-0.07677543186180422 x 100 = -7.68%