-33.85% is the change from 257 to 170
Calculation steps:
[( 170 - 257 ) ÷ 257] x 100 = -33.85%
Formula
Percentage change = [(170 - 257) / 257] x 100
Subtract the new number by the original number
170 - 257 = -87
-87 ÷ 257 = -0.33852140077821014
-0.33852140077821014 x 100 = -33.85%