-83.19% is the change from 339 to 57
Calculation steps:
[( 57 - 339 ) ÷ 339] x 100 = -83.19%
Formula
Percentage change = [(57 - 339) / 339] x 100
Subtract the new number by the original number
57 - 339 = -282
-282 ÷ 339 = -0.831858407079646
-0.831858407079646 x 100 = -83.19%