-85.09% is the change from 530 to 79
Calculation steps:
[( 79 - 530 ) ÷ 530] x 100 = -85.09%
Formula
Percentage change = [(79 - 530) / 530] x 100
Subtract the new number by the original number
79 - 530 = -451
-451 ÷ 530 = -0.8509433962264151
-0.8509433962264151 x 100 = -85.09%