A television manufacturing company produces its own speakers, which are used in the production of its television sets. The television sets are assembled on a continuous production line at rate of 8,000 per month. The company is interested in determining when and how much to procure, given the following information:

(I) Each time a batch is produced, a set-up cost of Rs.12,000 is incurred.

(II) The cost of keeping a speaker in stock is Rs. 0.30 per month.

(III) The production cost of a single speaker is Rs.10.00 and can be assumed to be a unit cost.

(IV) Shortage of a speaker, (if there exists) costs Rs. 1.10 per month.