-80.54% is the change from 257 to 50
Calculation steps:
[( 50 - 257 ) ÷ 257] x 100 = -80.54%
Formula
Percentage change = [(50 - 257) / 257] x 100
Subtract the new number by the original number
50 - 257 = -207
-207 ÷ 257 = -0.8054474708171206
-0.8054474708171206 x 100 = -80.54%