-3.89% is the change from 848 to 815
Calculation steps:
[( 815 - 848 ) ÷ 848] x 100 = -3.89%
Formula
Percentage change = [(815 - 848) / 848] x 100
Subtract the new number by the original number
815 - 848 = -33
-33 ÷ 848 = -0.03891509433962264
-0.03891509433962264 x 100 = -3.89%