-61.5% is the change from 400 to 154
Calculation steps:
[( 154 - 400 ) ÷ 400] x 100 = -61.5%
Formula
Percentage change = [(154 - 400) / 400] x 100
Subtract the new number by the original number
154 - 400 = -246
-246 ÷ 400 = -0.615
-0.615 x 100 = -61.5%