Suppose a contractor employs carpenters, bricklayers, and plumbers, working three shifts per day. The number of labor-hours employed in each shift is summarized in the matrix on the right. Shift 2 1 Carpenters 30 15 10 Bricklayers 35 5 5 Labor in shift 1 costs $10 per hour, in shift 2 $15 per hour, and in shift 3 $20 per hour. Use matrix multiplication to compute the amount spent on each type of labor. Plumbers 35 35 20

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