-9.76% is the change from 830 to 749
Calculation steps:
[( 749 - 830 ) ÷ 830] x 100 = -9.76%
Formula
Percentage change = [(749 - 830) / 830] x 100
Subtract the new number by the original number
749 - 830 = -81
-81 ÷ 830 = -0.09759036144578313
-0.09759036144578313 x 100 = -9.76%