Please solve 1,2,3 and 4.

P20.39 CVP analysis; advertising decisions; spare capacity: manufacturer LO 20.9 InkRite Ltd manufactures two models of ballpoint pens, the Scholar and the Standard. Both products have proved to be popular in government schools. In the past year, the following data apply to these two products. The sales manager has had a $120000 increase in her budget allotment for advertising, and she wants to apply the money to the most profitable product. She is hoping to open up new markets in the private school sector. Customers do not consider the two products to be substitutes for each other. (Ignore income taxes.) Required 1. Suppose the sales manager decides to spend the entire $120000 on advertising the Scholar model. What is the minimum increase needed in sales units of the Scholar model to ensure that the total profit from the sales of the Scholar does not change? 2. Suppose InkRite decides to spend the entire $120000 on advertising the Standard model. What is the minimum increase needed in sales units of the Standard model to ensure that the total profit from the sales of the Standard does not change? 3. Suppose InkRite has only 100000 machine hours of spare capacity available for the production of both products and it is possible that the increased demand for each of the two products created by the additional advertising may exceed production capacity. Given that the company wishes to maximise its profitability, which product should be advertised? What is the estimated increase in contribution margin earned? 4. Do the calculations that you have performed in requirements 1 to 3 of this problem provide sufficient information for the sales manager to allow her to make decisions about how the increased advertising budget allocation should be spent? If not, provide some examples of other information that may be needed