-69.82% is the change from 845 to 255
Calculation steps:
[( 255 - 845 ) ÷ 845] x 100 = -69.82%
Formula
Percentage change = [(255 - 845) / 845] x 100
Subtract the new number by the original number
255 - 845 = -590
-590 ÷ 845 = -0.6982248520710059
-0.6982248520710059 x 100 = -69.82%