740% is the change from 100 to 840
Calculation steps:
[( 840 - 100 ) ÷ 100] x 100 = 740%
Formula
Percentage change = [(840 - 100) / 100] x 100
Subtract the new number by the original number
840 - 100 = 740
740 ÷ 100 = 7.4
7.4 x 100 = 740%
Example