-49.19% is the change from 494 to 251
Calculation steps:
[( 251 - 494 ) ÷ 494] x 100 = -49.19%
Formula
Percentage change = [(251 - 494) / 494] x 100
Subtract the new number by the original number
251 - 494 = -243
-243 ÷ 494 = -0.49190283400809715
-0.49190283400809715 x 100 = -49.19%