I need help with B, C, and D

A Printed Circuit Board (PCB) machine installs integrated circuits onto a board. Before starting to produce a board, the PCB machine requires a 21-minute setup. Once in production, the PCB machine requires only 0.19 minute per board. (Do not round intermediate calculations. Round your answer to 2 decimal places.) Currently, the PCB machine produces 450 boards between setups. Given this operating process, a. what is the capacity of the PCB machine (in boards per minute)? 4.22 boards per minute (Do not round intermediate calculations. Round your percentage answer to 2 decimal places.) Currently, the PCB machine produces 450 boards between setups. Given this operating process, b. what is the utilization of the PCB machine? percent Say the PCB machine produces 300 boards between setups and demand is 2 boards per c. minute. Given this operating process, what is the average inventory of boards at the PCB machine? (Round your final answer to 2 decimal places.) Demand for boards occurs at the rate of 2 boards per minute. What is the smallest batch size d. such that the PCB machine does not constrain the flow rate through the process? batch size