-62.72% is the change from 845 to 315
Calculation steps:
[( 315 - 845 ) ÷ 845] x 100 = -62.72%
Formula
Percentage change = [(315 - 845) / 845] x 100
Subtract the new number by the original number
315 - 845 = -530
-530 ÷ 845 = -0.6272189349112426
-0.6272189349112426 x 100 = -62.72%