-10% is the change from 510 to 459
Calculation steps:
[( 459 - 510 ) ÷ 510] x 100 = -10%
Formula
Percentage change = [(459 - 510) / 510] x 100
Subtract the new number by the original number
459 - 510 = -51
-51 ÷ 510 = -0.1
-0.1 x 100 = -10%
Example