-58.5% is the change from 400 to 166
Calculation steps:
[( 166 - 400 ) ÷ 400] x 100 = -58.5%
Formula
Percentage change = [(166 - 400) / 400] x 100
Subtract the new number by the original number
166 - 400 = -234
-234 ÷ 400 = -0.585
-0.585 x 100 = -58.5%