-55.1% is the change from 510 to 229
Calculation steps:
[( 229 - 510 ) ÷ 510] x 100 = -55.1%
Formula
Percentage change = [(229 - 510) / 510] x 100
Subtract the new number by the original number
229 - 510 = -281
-281 ÷ 510 = -0.5509803921568628
-0.5509803921568628 x 100 = -55.1%