-64.5% is the change from 400 to 142
Calculation steps:
[( 142 - 400 ) ÷ 400] x 100 = -64.5%
Formula
Percentage change = [(142 - 400) / 400] x 100
Subtract the new number by the original number
142 - 400 = -258
-258 ÷ 400 = -0.645
-0.645 x 100 = -64.5%