Applied Calc - An underground electricity cable is to be laid between two boat docks on opposite banks of a river. One boat dock is 600 feet downstream from the other. The river is 200 feet wide. If the cost of laying the cable is $50 per foot under water and $30 per foot on land, how should the cable be laid to minimize the cost to connect the two docks? Also, find the minimum cost to lay such a cable.

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