-2.8% is the change from 750 to 729
Calculation steps:
[( 729 - 750 ) ÷ 750] x 100 = -2.8%
Formula
Percentage change = [(729 - 750) / 750] x 100
Subtract the new number by the original number
729 - 750 = -21
-21 ÷ 750 = -0.028
-0.028 x 100 = -2.8%
Example