-70% is the change from 260 to 78
Calculation steps:
[( 78 - 260 ) ÷ 260] x 100 = -70%
Formula
Percentage change = [(78 - 260) / 260] x 100
Subtract the new number by the original number
78 - 260 = -182
-182 ÷ 260 = -0.7
-0.7 x 100 = -70%
Example