26. The Clean-Well Company of India has introduced a new detergent KIN of which it can produce 20,000 packs per month of20 working days. The annual demand for this detergent is forecasted to be 1,92,000 packs, at a uniform rate. The set-up cost for the production of KIN is Rs 1,080 while the monthly cost for holding a pack in inventory is Re 0.30.

Determine,

(a) the optimum lot size,

(b) the optimum number of production runs, (

c) the time interval between the start of successive production runs, and

(d) the total variable cost, per year, associated with the lot size as determined in (a).