-78.63% is the change from 510 to 109
Calculation steps:
[( 109 - 510 ) ÷ 510] x 100 = -78.63%
Formula
Percentage change = [(109 - 510) / 510] x 100
Subtract the new number by the original number
109 - 510 = -401
-401 ÷ 510 = -0.7862745098039216
-0.7862745098039216 x 100 = -78.63%