-15.46% is the change from 304 to 257
Calculation steps:
[( 257 - 304 ) ÷ 304] x 100 = -15.46%
Formula
Percentage change = [(257 - 304) / 304] x 100
Subtract the new number by the original number
257 - 304 = -47
-47 ÷ 304 = -0.15460526315789475
-0.15460526315789475 x 100 = -15.46%