-84.36% is the change from 505 to 79
Calculation steps:
[( 79 - 505 ) ÷ 505] x 100 = -84.36%
Formula
Percentage change = [(79 - 505) / 505] x 100
Subtract the new number by the original number
79 - 505 = -426
-426 ÷ 505 = -0.8435643564356435
-0.8435643564356435 x 100 = -84.36%