A firm produce 2400 items annually the cost of setting up for production is 850 and weekly production rate is 100 units. The production cost is 5 per item. The annual storage and carrying is 10% if average inventory. what is the time that each optimum production run will take? options
12 months
9 months
6 months
1 months

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?