A perishable dairy product is ordered daily at a particular supermarket. The product costs $$1\mathrm{.}19$per unit and sells for $$1\mathrm{.}65.$If units are unsold at the end of the day, the supplier takes them back at a refund of $$1.$

Q$)$ The Supermarket$$s supplier wants to deliver an even $160$units per order so that it can fit other items in the cooler bins in the delivery truck. What is the refund amount it needs to give to the Supermarket so that it will order $160$units$?$

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