149.5% is the change from 400 to 998
Calculation steps:
[( 998 - 400 ) ÷ 400] x 100 = 149.5%
Formula
Percentage change = [(998 - 400) / 400] x 100
Subtract the new number by the original number
998 - 400 = 598
598 ÷ 400 = 1.495
1.495 x 100 = 149.5%
Example