: 6. (a) An energy efficient refrigration system is proposed by a vendor. The refrigration system will cost £50,000 to be installed, and will require £1,500 worth of maintenance each year for its life of 10 years. Energy costs will be £7,500 per year. A standard refrigration system will cost £40,000 and will require £1,000 worth of maintenance each year. Its energy costs will be £11,000 per year. Your company uses a discount rate of 10%. (i) Using Discount Factor Table Q6 which has been provided, calculate the LCC for both energy efficient refrigration system project and standard refrigration system project. [5 marks] (ii) Would your company invest in the energy efficient refrigration system project? Explain the reason. [2 marks] (b) A solar water heating system is being installed to a secondary school. The expected energy savings are £5,000 per year over the 10 year life of the system, with an initial investment of £30,000. (i) Using the discounted factor in Table Q6; calculate the NPV and PI at 5%, 10% and 15% discount values. [12 marks] (ii) What is the simple payback in years? [3 marks] (iii) What is the IRR value? [3 marks] Table Q6: Discount Factors Discount rate 5% 10% 12% 14% 15% 18% 0.952 0.909 0.893 0.877 0.870 0.847 0.907 0.826 0.797 0.769 0.756 0.718 0.864 0.751 0.712 0.675 0.658 0.609 0.823 0.683 0.636 0.592 0.572 0.516 0.567 0.519 0.497 0.437 0.784 0.621 0.746 0.564 0.711 0.513 0.507 0.456 0.432 0.370 0.452 0.400 0.376 0.314 0.404 0.351 0.327 0.266 8 0.677 0.467 0.645 0.424 9 0.361 0.308 0.284 0.225 10 0.614 0.386 0.322 0.270 0.247 0.191 Year 1 2 3 4567 20% 0.833 0.694 0.579 0.482 0.402 0.335 0.279 0.233 0.194 0.162