NB: if question ''a'' is confusing please go ahead and answer b and c. I only translated the question to english so it may not be in its right form.

1. a) Present a projects present value calculations mathematical principle as an equation. Explain briefly the various elements of your presentation and their significance. (1p)

(b) The energy-saving investment aims to reduce the energy consumption of the production process. The investment cost is 120,000, payable 6 months before the investment is put into operation. The investment can be used to avoid electricity consumption of 100 MWh / month (the change is the same throughout the operation period). At the same time, the personnel costs of the process increase by 1,500 / month. Present the investment cash flow statement and determine with the help of present value calculation whether the investment is profitable with a lifetime of 4 years and a yield requirement of 6%? The electricity price is assumed to be 51 / MWh. (3p)

c) What is the internal rate return of the above investment? (Estimate the internal rate to 0.5 percentage points.) (1p)