-32.56% is the change from 771 to 520
Calculation steps:
[( 520 - 771 ) ÷ 771] x 100 = -32.56%
Formula
Percentage change = [(520 - 771) / 771] x 100
Subtract the new number by the original number
520 - 771 = -251
-251 ÷ 771 = -0.32555123216601817
-0.32555123216601817 x 100 = -32.56%