p
daily production rate
d
daily demand rate
t
number of days in a production run
maximum inventory in terms of p d and t
(p - d) * t
maximum inventory in terms of Q
(1 - d/p)Q
average inventory
1/2*(1-d/p)Q
annual holding cost
1/2(1-d/p)Qch
setup (like ordering) cost
D/Q*Co
total cost
holding costs plus setup costs
Q*
sqrt(2DCo/((1-D/P)Ch))