-74.92% is the change from 315 to 79
Calculation steps:
[( 79 - 315 ) ÷ 315] x 100 = -74.92%
Formula
Percentage change = [(79 - 315) / 315] x 100
Subtract the new number by the original number
79 - 315 = -236
-236 ÷ 315 = -0.7492063492063492
-0.7492063492063492 x 100 = -74.92%