-84.42% is the change from 507 to 79
Calculation steps:
[( 79 - 507 ) ÷ 507] x 100 = -84.42%
Formula
Percentage change = [(79 - 507) / 507] x 100
Subtract the new number by the original number
79 - 507 = -428
-428 ÷ 507 = -0.8441814595660749
-0.8441814595660749 x 100 = -84.42%