-81.07% is the change from 338 to 64
Calculation steps:
[( 64 - 338 ) ÷ 338] x 100 = -81.07%
Formula
Percentage change = [(64 - 338) / 338] x 100
Subtract the new number by the original number
64 - 338 = -274
-274 ÷ 338 = -0.8106508875739645
-0.8106508875739645 x 100 = -81.07%