It's Still Raining (ISR) manufacturers umbrellas. In order to better budget and manage costs, they are analyzing the purchasing costs behavior. They have the following data from the last six months of last year.   Month Total Purchasing Costs Purchase Orders July $19,670 460 August $20,940 560 September $19,430 400 October $20,020 500 November $18,800 470 December $19,340 480   Using the regression analysis function in Excel, what is the unit variable cost? Please round your answer to two decimal places.

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