please assist me with the questions below

Question 3 3.1 Investors want to sink a mine shaft and build surface workshops and offices at a new mine over a period of five years. It is estimated that an amount of R900 million will have to be spent on the project every year for the first five years. It is foreseen that from year six the mine will start with production and generate positive cash flows of R320 million per year for 20 years until it reaches the end of its life. a) Draw a cash flow diagram for the project and state any assumptions that you may make. (3} b) Calculate the net present value of the project. Use a discount rate of 12%. You must do this by using at least two methods, e.g. calculator and spreadsheet. {10) c) Advise the investors on whether they should invest in this project or not. (1} 3.2 You are required to evaluate whether the present manual control system of the flotation circuitry should be replaced with a centralised monitoring and control system. The present system employs 18 personnel per shift and a three shift per day cycle. The centralised process control system will employ three attendants, one instrument technician and an additional two operators at the central control room per shift. The capital cost of CCTV cameras monitors and process controls installed and commissioned is estimated to be R1 870 000. Use the following information and the NPV method to determine whether the old (manual) system must be replaced by the centralised control (CCTV) system: Manual control employees' cost per month = R6 500 each Process control attendants' cost per month = RS 500 each Control room operators' cost per month = R12 000 each Instrument technician's cost per month = R15 000 Use a discount rate of 12% per annum 31 Assume that the centralised monitoring and control (CCTV) system has a life of six years Assume that the centralised monitoring and control system is just as effective as the manual control system