We provide customers a range of 4+tems, with quantities against each one. the charge is £33.00 per 20 items & then £1.10 per item over and above this price.
Item 1 = 13 Item 2 = 14 Item 3 = 6 Item 4 = 8
Total items quantity = 41 items
21 @ £1.10 = £23.10 + £33.00 = £56.10
I've tried doing it by totalling the items and then minusing 20, but if there are less than 20 items, this doesn't work, as it gives a negative.
Help?
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