-48.5% is the change from 499 to 257
Calculation steps:
[( 257 - 499 ) ÷ 499] x 100 = -48.5%
Formula
Percentage change = [(257 - 499) / 499] x 100
Subtract the new number by the original number
257 - 499 = -242
-242 ÷ 499 = -0.4849699398797595
-0.4849699398797595 x 100 = -48.5%