-33.08% is the change from 777 to 520
Calculation steps:
[( 520 - 777 ) ÷ 777] x 100 = -33.08%
Formula
Percentage change = [(520 - 777) / 777] x 100
Subtract the new number by the original number
520 - 777 = -257
-257 ÷ 777 = -0.3307593307593308
-0.3307593307593308 x 100 = -33.08%