And

The value that needs to be stored in Number to display the message "This number does not meet the condition" are 7 or less or 11 or higher.

Or

The numbers 5, 6, 7 and 8 would need to be stored in Number to make the program display the message "This number does not meet the condition".

Validation and error trapping

1. 

Pseudocode

Calculate price of sending parcel

Prompt user for ItemWeight, CostPerKilo

Get ItemWeight, CostPerKilo

If ItemWeight is a number and CostPerKilo is a number
 

CostofSendingParcel = ItemWeight * CostPerKilo

If CostofSendingParcel < 100

Display CostofSendingParcel

Else

CostAfterDiscount = CostofSendingParcel * 0.9

Display CostAfterDiscount

End If

Else Display ErrorMessage
 

End
2.