-21.11% is the change from 521 to 411
Calculation steps:
[( 411 - 521 ) ÷ 521] x 100 = -21.11%
Formula
Percentage change = [(411 - 521) / 521] x 100
Subtract the new number by the original number
411 - 521 = -110
-110 ÷ 521 = -0.21113243761996162
-0.21113243761996162 x 100 = -21.11%