-20.98% is the change from 510 to 403
Calculation steps:
[( 403 - 510 ) ÷ 510] x 100 = -20.98%
Formula
Percentage change = [(403 - 510) / 510] x 100
Subtract the new number by the original number
403 - 510 = -107
-107 ÷ 510 = -0.20980392156862746
-0.20980392156862746 x 100 = -20.98%