Two chemical plants, one at Multan and one at Mianwali, produce three types of fertilizer, low phosphorus (LP), medium phosphorus (MP), and high phosphorus (HP). At each plant, the fertilizer is produced in a single production run, so the three types are produced in fixed proportions. the Multan plant produces I ton of LP, 2 tons of Me, and 3 tons of FiP in a single operation, and it charges $600 for what is produced in one operation, whereas one operation of the Mianwali plant produces 1 ton of LP, 5 tons of M, and I ton of He, and it charges $ 1000 for what it produces in one operation. If a customer needs 100 tons of LP, 260 tons of MP, and 180 tons of HP, how many production runs should be ordered from each plant to minimize costs?