-66.97% is the change from 778 to 257
Calculation steps:
[( 257 - 778 ) ÷ 778] x 100 = -66.97%
Formula
Percentage change = [(257 - 778) / 778] x 100
Subtract the new number by the original number
257 - 778 = -521
-521 ÷ 778 = -0.6696658097686375
-0.6696658097686375 x 100 = -66.97%