97.6% is the change from 250 to 494
Calculation steps:
[( 494 - 250 ) ÷ 250] x 100 = 97.6%
Formula
Percentage change = [(494 - 250) / 250] x 100
Subtract the new number by the original number
494 - 250 = 244
244 ÷ 250 = 0.976
0.976 x 100 = 97.6%
Example