-78.98% is the change from 509 to 107
Calculation steps:
[( 107 - 509 ) ÷ 509] x 100 = -78.98%
Formula
Percentage change = [(107 - 509) / 509] x 100
Subtract the new number by the original number
107 - 509 = -402
-402 ÷ 509 = -0.7897838899803536
-0.7897838899803536 x 100 = -78.98%