-47.55% is the change from 490 to 257
Calculation steps:
[( 257 - 490 ) ÷ 490] x 100 = -47.55%
Formula
Percentage change = [(257 - 490) / 490] x 100
Subtract the new number by the original number
257 - 490 = -233
-233 ÷ 490 = -0.47551020408163264
-0.47551020408163264 x 100 = -47.55%