111.06% is the change from 398 to 840
Calculation steps:
[( 840 - 398 ) ÷ 398] x 100 = 111.06%
Formula
Percentage change = [(840 - 398) / 398] x 100
Subtract the new number by the original number
840 - 398 = 442
442 ÷ 398 = 1.1105527638190955
1.1105527638190955 x 100 = 111.06%