Your General Manager has been approached by his managers on the following transactions: a) The Sales Manager is negotiating with a customer and is confident that the customer will place the order amounting to $100,000. She wants to include the sales this month. b) The Stores Manager wants to change the method of valuation from the current FIFO (First In First Out) to LIFO (Last In First Out) as the recent prices of materials were lower. c) The Quality Manager has investigated the recent shipments of one of the materials and has found them to be unusable as they do not meet the standards. The Purchasing Manager insists that these materials should be kept at the purchased value until he negotiated the supplier. d) The HR Manager suggests, as the HR department is very busy it is unable to provide the payroll costs for the current month. This is not important as accounting department can include the costs in the following month. As the company's accountant advise the managers, with explanation, whether the suggestions given are appropriate. Support your explanation based on accounting principles and concepts