An oil refinery is located on the north bank of a straight river that is 2 km wide. A pipeline is to be constructed from the refinery to storage tanks located on the south bank of the river 8 km downstream of the refinery. The cost to lay pipe on land is $300, 000/km, while the cost to lay pipe under water is $500, 000/km. What is the minimum cost of building the pipeline? Include units in your answer. Round your answer to two decimal places. Verify the answer you get is a minimum