Please help me solve these problems by writing down how you calculate step by step,and tell me why I should solve it in this way.

I don't want the solution which is already on this website,

3-36. In a single-period inventory model, the demand occurs uniformly over the inventory period. The carrying cost is $2 per unit per year, the shortage cost is $10, and the item cost is $8. Assume that the demand follows a uniform distribution over the range 100 to 200 . Find Q. 3-37. Solve Problem 3-36 assuming that the demand occurs uniformly over the inventory period with a range from 100 to 300 units