please show step by step!!! $2.$ Suppose that Ivar Jorgenson, a head operations planner for Bi$-$Product Company, finds out that the long$-$ range forecast was revised by the growing economy. As a result, the marketing department at Bi$-$Product Company raises its forecast for quarter $2,3$ and $4$ sales of Product B to $7000,6500$ and $7000$ units respectively. He will now have to develop and analyze several alternative level plans for next year. Keep in mind that each of these plans must consider: Beginning inventory of $1,000$ units of Product A and $500$ units of Product B$.$ Ending inventory and back orders for quarter $4$ must be zero Each plan must have the same level total$-$output rate each quarter.