-48.53% is the change from 612 to 315
Calculation steps:
[( 315 - 612 ) ÷ 612] x 100 = -48.53%
Formula
Percentage change = [(315 - 612) / 612] x 100
Subtract the new number by the original number
315 - 612 = -297
-297 ÷ 612 = -0.4852941176470588
-0.4852941176470588 x 100 = -48.53%