James Walter is a production planner for S&T Labs, in New York, and he has the master production plan shown below:

$\backslash$ table $[[\backslash$ table $[[$ Period $],[($ weeks $)]],1,2,3,4,5,6,7,8,9,10,11,12],[\backslash$ table $[[$ Gross $],[$ Requirements $]],,35,,40,,10,,,25,10,,45]]$

Lead time $=1$ ?period; setup costs $=$ $ $250$ ; holding cost $=$ $ $15$ ?per week; stockout cost $=$ $ $10$ ?per week. Develop an ordering plan and costs for James, using these techniques:

a $)$ ?Lot $-$ for $-$ lot.

b $)$ ?EOQ.

c $)$ ?POQ.

d $)$ Which plan has the lowest cost?