-99.6% is the change from 750 to 3
Calculation steps:
[( 3 - 750 ) ÷ 750] x 100 = -99.6%
Formula
Percentage change = [(3 - 750) / 750] x 100
Subtract the new number by the original number
3 - 750 = -747
-747 ÷ 750 = -0.996
-0.996 x 100 = -99.6%
Example