-45.28% is the change from 508 to 278
Calculation steps:
[( 278 - 508 ) ÷ 508] x 100 = -45.28%
Formula
Percentage change = [(278 - 508) / 508] x 100
Subtract the new number by the original number
278 - 508 = -230
-230 ÷ 508 = -0.452755905511811
-0.452755905511811 x 100 = -45.28%