Please can I have assistance and explanation with this section because I'm confusing my method of calculation

Seata Lta manufactures chairs. The following information was extracted from the budget for the month ended 31 March 2022: Sales 5 000 units Selling price per unit R300 Variable manufacturing cost per unit R105 Manufacturing overheads (all fixed) R240 000 Selling costs 25% of sales Administrative costs (all fixed) R300 000 3.2 Use the information provided below to answer the following questions: (5 marks) 3.2.1 How much more can the company spend on salaries and still break even? (2 marks) 3.2.2 Calculate the sales value that is required to earn a net profit of R500 000. (3 marks) INFORMATION The following information provided by Montana Lid, which manufactures only one product, is available: Fixed costs R600 000 Sales R2 500 000 Variable costs R1 500 000 Use the information provided below to prepare the following for November and December 2021: (20 Marks) 4.1 Debtors Collection Schedule (4 marks) 4.2 Cash Budget (16 marks)