If payment is made after the date when payment is due and payable, Spinneys shall be entitled to receive, in addition to interest and late charges as provided in Section 20.01, any additional (but not lesser) amount it would have been entitled to if payment had been made timely, based upon the exchange rate in effect on the date payment was due and payable. Proof of the applicable exchange rate shall be provided to Spinneys at the time each payment is made.