PT Paya is a factory that produces umbrellas. This company requires 12,000 units of umbrella handles for 1 year. The ordering fee is Rp. 50,000 for each order, regardless of the number of components ordered. Storage fee (per unit/year) is 10% of the component price. Material price Rp. 2500,- per unit. Working days in a year are 250 days. Delivery lead time is 4 days. The annual warning for umbrellas is 10,000 units per year. The umbrella production speed is 60 units per day. The set up fee for making an umbrella is Rp. 40.000,- per pair. The cost of storing umbrellas as a finished product is Rp 6000/unit/year.

a) What is the most economical number of orders for umbrella handles (EOQ), order frequency, time interval between orders, reorder point and total cost? b) What is the POQ? What is the maximum supply? What is the Total Cost?