-32.88% is the change from 815 to 547
Calculation steps:
[( 547 - 815 ) ÷ 815] x 100 = -32.88%
Formula
Percentage change = [(547 - 815) / 815] x 100
Subtract the new number by the original number
547 - 815 = -268
-268 ÷ 815 = -0.32883435582822085
-0.32883435582822085 x 100 = -32.88%