-50% is the change from 304 to 152
Calculation steps:
[( 152 - 304 ) ÷ 304] x 100 = -50%
Formula
Percentage change = [(152 - 304) / 304] x 100
Subtract the new number by the original number
152 - 304 = -152
-152 ÷ 304 = -0.5
-0.5 x 100 = -50%
Example