-84.62% is the change from 78 to 12
Calculation steps:
[( 12 - 78 ) ÷ 78] x 100 = -84.62%
Formula
Percentage change = [(12 - 78) / 78] x 100
Subtract the new number by the original number
12 - 78 = -66
-66 ÷ 78 = -0.8461538461538461
-0.8461538461538461 x 100 = -84.62%