-68.87% is the change from 257 to 80
Calculation steps:
[( 80 - 257 ) ÷ 257] x 100 = -68.87%
Formula
Percentage change = [(80 - 257) / 257] x 100
Subtract the new number by the original number
80 - 257 = -177
-177 ÷ 257 = -0.688715953307393
-0.688715953307393 x 100 = -68.87%