-57.5% is the change from 400 to 170
Calculation steps:
[( 170 - 400 ) ÷ 400] x 100 = -57.5%
Formula
Percentage change = [(170 - 400) / 400] x 100
Subtract the new number by the original number
170 - 400 = -230
-230 ÷ 400 = -0.575
-0.575 x 100 = -57.5%