-40.59% is the change from 510 to 303
Calculation steps:
[( 303 - 510 ) ÷ 510] x 100 = -40.59%
Formula
Percentage change = [(303 - 510) / 510] x 100
Subtract the new number by the original number
303 - 510 = -207
-207 ÷ 510 = -0.40588235294117647
-0.40588235294117647 x 100 = -40.59%