A manufacturer ships all merchandise FOB Dallas. His trucks transport the merchandise to Dallas, where it is turned over to the carrier specified by the retail buyer. A retailer in Kansas has ordered merchandise with a total billed cost of $$8,400.$ The terms are $3/10$ EOM. The entire order was shipped on August $22,$ with transportation charges of $$210($from Dallas to Kansas City$)$ prepaid. If the store pays for this merchandise on September $8,$ how much should be paid to the vendor?