-80.63% is the change from 315 to 61
Calculation steps:
[( 61 - 315 ) ÷ 315] x 100 = -80.63%
Formula
Percentage change = [(61 - 315) / 315] x 100
Subtract the new number by the original number
61 - 315 = -254
-254 ÷ 315 = -0.8063492063492064
-0.8063492063492064 x 100 = -80.63%