-60% is the change from 770 to 308
Calculation steps:
[( 308 - 770 ) ÷ 770] x 100 = -60%
Formula
Percentage change = [(308 - 770) / 770] x 100
Subtract the new number by the original number
308 - 770 = -462
-462 ÷ 770 = -0.6
-0.6 x 100 = -60%
Example