-32.47% is the change from 770 to 520
Calculation steps:
[( 520 - 770 ) ÷ 770] x 100 = -32.47%
Formula
Percentage change = [(520 - 770) / 770] x 100
Subtract the new number by the original number
520 - 770 = -250
-250 ÷ 770 = -0.3246753246753247
-0.3246753246753247 x 100 = -32.47%