12% is the change from 750 to 840
Calculation steps:
[( 840 - 750 ) ÷ 750] x 100 = 12%
Formula
Percentage change = [(840 - 750) / 750] x 100
Subtract the new number by the original number
840 - 750 = 90
90 ÷ 750 = 0.12
0.12 x 100 = 12%
Example