-48.65% is the change from 666 to 342
Calculation steps:
[( 342 - 666 ) ÷ 666] x 100 = -48.65%
Formula
Percentage change = [(342 - 666) / 666] x 100
Subtract the new number by the original number
342 - 666 = -324
-324 ÷ 666 = -0.4864864864864865
-0.4864864864864865 x 100 = -48.65%