100.4% is the change from 248 to 497
Calculation steps:
[( 497 - 248 ) ÷ 248] x 100 = 100.4%
Formula
Percentage change = [(497 - 248) / 248] x 100
Subtract the new number by the original number
497 - 248 = 249
249 ÷ 248 = 1.0040322580645162
1.0040322580645162 x 100 = 100.4%