100.4% is the change from 498 to 998
Calculation steps:
[( 998 - 498 ) ÷ 498] x 100 = 100.4%
Formula
Percentage change = [(998 - 498) / 498] x 100
Subtract the new number by the original number
998 - 498 = 500
500 ÷ 498 = 1.0040160642570282
1.0040160642570282 x 100 = 100.4%