-76.7% is the change from 339 to 79
Calculation steps:
[( 79 - 339 ) ÷ 339] x 100 = -76.7%
Formula
Percentage change = [(79 - 339) / 339] x 100
Subtract the new number by the original number
79 - 339 = -260
-260 ÷ 339 = -0.7669616519174042
-0.7669616519174042 x 100 = -76.7%