Optimal staffing for 95 dresses Steps:

• Require 95 machinists to produce 95 dresses at 1 per day.
• Supervisors needed: ceil(95/10) = 10 to cover all machinists.
• Machinist cost: 95 × $30 =$2850.
• Supervisor cost: 10 × $40 =$400.
• Total cost: $2850 +$400 = $3250.

Why D is correct:

• Matches exact calculation using ceiling function for supervisors to ensure full coverage per capacity limit.

Why the others are wrong:

• A: Ignores supervisor costs entirely.
• B: Uses 9 supervisors ($360), understaffing as they cover only 90 machinists.
• C: Likely miscounts by reducing machinists or supervisors by 1, yielding $20 less.

Final answer: D