-67.1% is the change from 845 to 278
Calculation steps:
[( 278 - 845 ) ÷ 845] x 100 = -67.1%
Formula
Percentage change = [(278 - 845) / 845] x 100
Subtract the new number by the original number
278 - 845 = -567
-567 ÷ 845 = -0.6710059171597633
-0.6710059171597633 x 100 = -67.1%