-78.71% is the change from 512 to 109
Calculation steps:
[( 109 - 512 ) ÷ 512] x 100 = -78.71%
Formula
Percentage change = [(109 - 512) / 512] x 100
Subtract the new number by the original number
109 - 512 = -403
-403 ÷ 512 = -0.787109375
-0.787109375 x 100 = -78.71%