-34.16% is the change from 770 to 507
Calculation steps:
[( 507 - 770 ) ÷ 770] x 100 = -34.16%
Formula
Percentage change = [(507 - 770) / 770] x 100
Subtract the new number by the original number
507 - 770 = -263
-263 ÷ 770 = -0.34155844155844156
-0.34155844155844156 x 100 = -34.16%