Hydropower Engineering past question

The mean monthly flow of a river in a typical year are as follows [table]. The effective head of the ROR plant is 48 m and can be assumed constant. Other data: Fixed cost: USD 2795×10⁶; Variable cost: US$ 645/kW; Annual O&M cost: 2.5% of variable cost; Energy price: US$ 38/Mwh for primary and secondary energy; Interest rate: 11%; Economic life of the project: 45 years; Overall efficiency: 89%. Determine the best installed capacity, firm energy, secondary energy, total energy, and plant factor. [9]