Please help with parts A, B, C, and D. ASAP. Thank you.

A toy manufacturer uses 43,740 rubber wheels per year for its popular dump truck series. The firm makes its own wheels, which it can produce at a rate of 800 per day. The toy trucks are assembled uniformly over the entire year, Carrying cost is $1.60 per wheel per year. Setup cost for a production run is $40. The firm operates 243 days per year. Determine the following: a. Optimal run size (Round your answer to a whole number, following normal rules of rounding.) b. Use your final answer from part a to determine minimum total annual cost for carrying and setup. (Round your answer to a whole number.) c. Cycle time for the optimal run size (Round your answer to two decimal points.) d. Run time (Round your answer to two decimal points.)