Astro Industries of Minneapolis, Minnesota, makes weekly shipments to $5$ customers in the Dallas area. Each customer's order weighs, on average, $2,500$ pounds. A direct truck shipment from Minneapolis to Dallas costs $\backslash (\backslash$$ $2,400\backslash ).$ The maximum load per truck is $30,000$ pounds. a$.$ The total cost for Astro to make direct, single$-$order shipments to all of its customers is $\backslash (\backslash$$ $\backslash )$ per week. $($Enter your response as a whole number.$)$