-84.62% is the change from 507 to 78
Calculation steps:
[( 78 - 507 ) ÷ 507] x 100 = -84.62%
Formula
Percentage change = [(78 - 507) / 507] x 100
Subtract the new number by the original number
78 - 507 = -429
-429 ÷ 507 = -0.8461538461538461
-0.8461538461538461 x 100 = -84.62%