-34.29% is the change from 770 to 506
Calculation steps:
[( 506 - 770 ) ÷ 770] x 100 = -34.29%
Formula
Percentage change = [(506 - 770) / 770] x 100
Subtract the new number by the original number
506 - 770 = -264
-264 ÷ 770 = -0.34285714285714286
-0.34285714285714286 x 100 = -34.29%