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 $$19,670460$

August $$20,940560$

September

$$19,430$

$400$

October $$20,020500$

November $$18,800470$

December $$19,340480$

Using the regression analysis function in Excel, what are the expected costs if $520$ purchase orders are processed? Please round your answer to the nearest whole dollar.