A fiber optic cable company sells three types of cable. Grade A costs $12/foot. Grade B costs

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A fiber optic cable company sells three types of cable. Grade A costs $12/foot. Grade B costs $6/foot. Grade Ccosts $9.25/foot. Last week they installed 327 feet of GradeA, 457 feet of Grade B, and 855 feet of Grade C. What is themean cost per foot of cable installed?