Let's break down the problem step by step. ### 1. **List the Crew and Equipment** **Crew:** - 1 Equipment Operator: $42/hr - 4 Truck Drivers: $35/hr each **Equipment:** - 1 Hydraulic Excavator: $120/hr - 4 Dump Trucks: $85/hr each ### 2. **Weekly Hours Worked** Each works **4 days × 10 hours/day = 40 hours/week**. ### 3. **Calculate Total Weekly Costs** #### **A. Labor Costs:** - **Operator:** $42/hr × 40 hr = **$1,680/week** - **Truck Drivers:** 4 × $35/hr × 40 hr = 4 × $1,400 = **$5,600/week** - **Total Labor Cost (per week):** $1,680 + $5,600 = **$7,280/week** #### **B. Equipment Costs:** - **Excavator:** $120/hr × 40 hr = **$4,800/week** - **Dump Trucks:** 4 × $85/hr × 40 hr = 4 × $3,400 = **$13,600/week** - **Total Equipment Cost (per week):** $4,800 + $13,600 = **$18,400/week** ### 4. **Total Labor Hours** - **Operator:** 40 hr/week - **Truck Drivers:** 4 × 40 hr = 160 hr/week - **Total Labor Hours (per week):** 40 + 160 = **200 labor hours/week** ### 5. **Average Costs per Labor Hour** #### **A. Average Labor Cost per Labor Hour** \[ \text{Average Labor Cost per Labor Hour} = \frac{\text{Total Labor Cost}}{\text{Total Labor Hours}} = \frac{7,280}{200} = \$36.40 \text{ per labor hour} \] #### **B. Equipment Cost per Labor Hour** \[ \text{Equipment Cost per Labor Hour} = \frac{\text{Total Equipment Cost}}{\text{Total Labor Hours}} = \frac{18,400}{200} = \$92.00 \text{ per labor hour} \] --- ## **Final Answers** ### **Average Labor Cost per Labor Hour:** \[ \boxed{\$36.40} \] ### **Equipment Cost per Labor Hour:** \[ \boxed{\$92.00} \]