Solve the applied problem.A power plant is located on the bank of a river that is mile wi...

Solve the applied problem.

A power plant is located on the bank of a river that is mile wide. Wiring is to be laid across the river and then along the shore to a substation 8 miles downstream, as shown in the figure. It costs $12,000 per mile for underwater wiring and $8000 per mile for wiring on land. If $72,000 is to be spent on the project, how far from the substation should the wiring come to shore?