Building Validation Expression of field that is within a certain range of a calculation of two other fields

Would anyone be able to help me out with this? I have been playing with it for a while, but have not been able to come to a solution where the validation expression flags correctly.

I have a validation that I need to build to that will flag the Net Case Weight field if the value is smaller than the saleable units per case field times the saleable unit weight field and

greater than the SU per CA times the SU Weight plus 20%.

The below is the code that I have currently. This expression does flag correctly if the value is smaller than the minimum amount and over the maximum amount, but the range between the 20% it's still erroring out and I need it to be flagging as in range.

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