-40.78% is the change from 510 to 302
Calculation steps:
[( 302 - 510 ) ÷ 510] x 100 = -40.78%
Formula
Percentage change = [(302 - 510) / 510] x 100
Subtract the new number by the original number
302 - 510 = -208
-208 ÷ 510 = -0.40784313725490196
-0.40784313725490196 x 100 = -40.78%