-15.75% is the change from 508 to 428
Calculation steps:
[( 428 - 508 ) ÷ 508] x 100 = -15.75%
Formula
Percentage change = [(428 - 508) / 508] x 100
Subtract the new number by the original number
428 - 508 = -80
-80 ÷ 508 = -0.15748031496062992
-0.15748031496062992 x 100 = -15.75%