A soft drinks firm has two bottling plants, one located at P and the other located at Q. each plant produces three different soft drinks A, B and C. The capacities of two plants in number of bottles per day, are as follows:

A market survey indicates that during the month of April, there will be a demand of 24000 bottles of A, 16000 bottles of B and 48000 bottles of C. The cost of running the two plants P and Q are respectively Rs.6000 and Rs.4000 per day. find graphically, the number of days for which either of the two plants P and Q should be run in the month of April so as to minimize production cost while still meeting the market demand.