-79.21% is the change from 505 to 105
Calculation steps:
[( 105 - 505 ) ÷ 505] x 100 = -79.21%
Formula
Percentage change = [(105 - 505) / 505] x 100
Subtract the new number by the original number
105 - 505 = -400
-400 ÷ 505 = -0.7920792079207921
-0.7920792079207921 x 100 = -79.21%