-18.62% is the change from 521 to 424
Calculation steps:
[( 424 - 521 ) ÷ 521] x 100 = -18.62%
Formula
Percentage change = [(424 - 521) / 521] x 100
Subtract the new number by the original number
424 - 521 = -97
-97 ÷ 521 = -0.18618042226487524
-0.18618042226487524 x 100 = -18.62%