-73.65% is the change from 315 to 83
Calculation steps:
[( 83 - 315 ) ÷ 315] x 100 = -73.65%
Formula
Percentage change = [(83 - 315) / 315] x 100
Subtract the new number by the original number
83 - 315 = -232
-232 ÷ 315 = -0.7365079365079366
-0.7365079365079366 x 100 = -73.65%