DiggingDeep Mining company has to fill an order of 40 tons of iron ore and 18 tons of cooper ore. They operate two mines producing both ores. Mine 1 yields four tons of iron and one ton of copper and costs $3200 per day to operate, while mine II yields two tons of iron and two tons of copper and costs $2600 per day to operate. Determine how many days each mine should be used to fill this order at the least total cost.