-3.78% is the change from 847 to 815
Calculation steps:
[( 815 - 847 ) ÷ 847] x 100 = -3.78%
Formula
Percentage change = [(815 - 847) / 847] x 100
Subtract the new number by the original number
815 - 847 = -32
-32 ÷ 847 = -0.03778040141676505
-0.03778040141676505 x 100 = -3.78%