a$)$ Calculate the net present value of the investment, which for the first three years brings a

positive flow of PLN $2,600$ at the end of each year, while the following year brings one flow

of PLN $1,800$ in mid$-$year. The investment amount is PLN $7,500$ now. Assume the interest

rate $($cost of capital$)$ at $8\%.$

b$)$ Please also provide the discounted payback period for this investment.

c$)$ Comment the results obtained in a and $b)$ and the entire investment.

d$)$ What amount of investment would give the same NPV as in a$)$ if the investment would

bring PLN $2,800$ annually for $3$ years $($only$).$