Question 1: [10 Marks] First: Faculty of Engineering and Technology at PTUK purchased a 3D printer for $900. The maintenance costs $300 in the first year and the cost will increase by $60 per year in the next three years. Construct the cash flow diagram and show all engineering economy symbols and their values if the interest rate is 7% (3 marks) Second: An initial investment of $3,500,000 in a business opportunity can generate a net income of $900,000 per year. Assume that i= 5%, what is the estimated payback period for this investment? (4 marks) Third: A dairy company has invested an amount of money in a new plant, for which it expects to recover four times the invested amount in 10 years. What is the rate of return, which this company expects, from investing in this business