-78.42% is the change from 505 to 109
Calculation steps:
[( 109 - 505 ) ÷ 505] x 100 = -78.42%
Formula
Percentage change = [(109 - 505) / 505] x 100
Subtract the new number by the original number
109 - 505 = -396
-396 ÷ 505 = -0.7841584158415842
-0.7841584158415842 x 100 = -78.42%