-94.23% is the change from 815 to 47
Calculation steps:
[( 47 - 815 ) ÷ 815] x 100 = -94.23%
Formula
Percentage change = [(47 - 815) / 815] x 100
Subtract the new number by the original number
47 - 815 = -768
-768 ÷ 815 = -0.9423312883435583
-0.9423312883435583 x 100 = -94.23%