-30.74% is the change from 257 to 178
Calculation steps:
[( 178 - 257 ) ÷ 257] x 100 = -30.74%
Formula
Percentage change = [(178 - 257) / 257] x 100
Subtract the new number by the original number
178 - 257 = -79
-79 ÷ 257 = -0.30739299610894943
-0.30739299610894943 x 100 = -30.74%