-10% is the change from 830 to 747
Calculation steps:
[( 747 - 830 ) ÷ 830] x 100 = -10%
Formula
Percentage change = [(747 - 830) / 830] x 100
Subtract the new number by the original number
747 - 830 = -83
-83 ÷ 830 = -0.1
-0.1 x 100 = -10%
Example