-45.38% is the change from 509 to 278
Calculation steps:
[( 278 - 509 ) ÷ 509] x 100 = -45.38%
Formula
Percentage change = [(278 - 509) / 509] x 100
Subtract the new number by the original number
278 - 509 = -231
-231 ÷ 509 = -0.4538310412573674
-0.4538310412573674 x 100 = -45.38%