-60.25% is the change from 815 to 324
Calculation steps:
[( 324 - 815 ) ÷ 815] x 100 = -60.25%
Formula
Percentage change = [(324 - 815) / 815] x 100
Subtract the new number by the original number
324 - 815 = -491
-491 ÷ 815 = -0.6024539877300613
-0.6024539877300613 x 100 = -60.25%