A simply supported rectongular beam of depth 450mm and width of room is spanning an effective distance of 5 meters. It is subjected to a combination of variable and permonuct actions of 5kn/m and 10kw/m, respectively. Design the beam for bending reipfrcement using concrek grade C 30/37 and sted 5500 . Concrete cover is 25mm and the ditumeter of shear lints is 8mm. (Do not ferget to consider seff-reight)