-81.61% is the change from 348 to 64
Calculation steps:
[( 64 - 348 ) ÷ 348] x 100 = -81.61%
Formula
Percentage change = [(64 - 348) / 348] x 100
Subtract the new number by the original number
64 - 348 = -284
-284 ÷ 348 = -0.8160919540229885
-0.8160919540229885 x 100 = -81.61%