-39.64% is the change from 845 to 510
Calculation steps:
[( 510 - 845 ) ÷ 845] x 100 = -39.64%
Formula
Percentage change = [(510 - 845) / 845] x 100
Subtract the new number by the original number
510 - 845 = -335
-335 ÷ 845 = -0.39644970414201186
-0.39644970414201186 x 100 = -39.64%