RDLC expression needs to be modified for betterment

I am working on a percentage column to calculate the values from two other columns. but I have a #Error at some places and some others get 235.5 % both are wrong in my case. Others are fine. Please look at my expression and help me modify the expression accordingly.

My expression is

=iif(Fields!Actual_ship_qty.Value=0 or Fields!plan_to_ship.Value=0,0,CDEC(((Fields!Actual_ship_qty.Value-Fields!plan_to_ship.Value)/Fields!plan_to_ship.Value)+1)*100)

Please help me how to work on this and solve it.

Thanks,

Deepak