-78.53% is the change from 815 to 175
Calculation steps:
[( 175 - 815 ) ÷ 815] x 100 = -78.53%
Formula
Percentage change = [(175 - 815) / 815] x 100
Subtract the new number by the original number
175 - 815 = -640
-640 ÷ 815 = -0.7852760736196319
-0.7852760736196319 x 100 = -78.53%