Kellogg is a new cereal formed of a mixture of bran and rice that contians atleast 88 gm of protein and atleast 36 miligram of iron per kg. Knowing that bran contains 80 gm of protein and 40 miligram of iron per kilogram, and that rice contains 100 gm of protein and 30 miligram of iron per kilogram, find the minimum cost of producing this new cereal if bran costs Rs.5 kilogram and rice costs Rs. 4 per kilogram.