a$)$ What is the optimal size of the production run? units $($round your response to the nearest whole number$).$

b$)$ What is the average holding cost per year? $ $($round your response to two decimal places$).$

c$)$ What is the average setup cost per year? $ $($round your response to two decimal places$).$

d$)$ What is the total cost per year, including the cost of the lights? $ $($round your response to two decimal places$).$