An island is 3.5 mi from the nearest point on a straight shoreline; that point is 8 mi from a power station (see figure). A utility company plans to lay electrical cable underwater from the island to the shore and then underground along the shore to the power station. Assume that it costs $2400/mi to lay underwater cable and $1200>mi to lay underground cable. At what point should the underwater cable meet the shore to minimize the cost of the project?

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Island Cable 3.5 mi Power station Shore 8 mi