-0.36% is the change from 830 to 827
Calculation steps:
[( 827 - 830 ) ÷ 830] x 100 = -0.36%
Formula
Percentage change = [(827 - 830) / 830] x 100
Subtract the new number by the original number
827 - 830 = -3
-3 ÷ 830 = -0.0036144578313253013
-0.0036144578313253013 x 100 = -0.36%