-5.35% is the change from 505 to 478
Calculation steps:
[( 478 - 505 ) ÷ 505] x 100 = -5.35%
Formula
Percentage change = [(478 - 505) / 505] x 100
Subtract the new number by the original number
478 - 505 = -27
-27 ÷ 505 = -0.053465346534653464
-0.053465346534653464 x 100 = -5.35%