-80.61% is the change from 330 to 64
Calculation steps:
[( 64 - 330 ) ÷ 330] x 100 = -80.61%
Formula
Percentage change = [(64 - 330) / 330] x 100
Subtract the new number by the original number
64 - 330 = -266
-266 ÷ 330 = -0.806060606060606
-0.806060606060606 x 100 = -80.61%