Calculate the total labor cost for Job Y and Job Z, considering normal time, evening overtime, and weekend overtime rates.

Step 1: Calculate the cost for normal time, evening overtime, and weekend overtime for each job using their respective rates.

• For Job Y: Normal time cost = $10,000 \text{ hours} \times 8 \text{ N/hour} = 80,000 \text{ N}$ Evening overtime cost = $1,200 \text{ hours} \times \frac{32}{3} \text{ N/hour} = 12,800 \text{ N}$ Weekend overtime cost = $100 \text{ hours} \times 16 \text{ N/hour} = 1,600 \text{ N}$ Total labour cost for Job Y = $80,000 + 12,800 + 1,600 = \boxed{\text{N}94,400}$

• For Job Z: Normal time cost = $8,000 \text{ hours} \times 8 \text{ N/hour} = 64,000 \text{ N}$ Evening overtime cost = $2,100 \text{ hours} \times \frac{32}{3} \text{ N/hour} = 22,400 \text{ N}$ Weekend overtime cost = $600 \text{ hours} \times 16 \text{ N/hour} = 9,600 \text{ N}$ Total labour cost for Job Z = $64,000 + 22,400 + 9,600 = \boxed{\text{N}96,000}$