-67.53% is the change from 770 to 250
Calculation steps:
[( 250 - 770 ) ÷ 770] x 100 = -67.53%
Formula
Percentage change = [(250 - 770) / 770] x 100
Subtract the new number by the original number
250 - 770 = -520
-520 ÷ 770 = -0.6753246753246753
-0.6753246753246753 x 100 = -67.53%