102.41% is the change from 415 to 840
Calculation steps:
[( 840 - 415 ) ÷ 415] x 100 = 102.41%
Formula
Percentage change = [(840 - 415) / 415] x 100
Subtract the new number by the original number
840 - 415 = 425
425 ÷ 415 = 1.0240963855421688
1.0240963855421688 x 100 = 102.41%