The construction cost of a hydroelectric power plant is $500000, the maintenance cost (done every 10 years) is $40000, and the annual operating cost is $1000. With this power plant, 1 million kWh of electricity will be produced annually. Which selling price (per kWh) of electricity makes the construction of the power plant viable when the interest rate is 20%? If necessary, you can choose more than one options. O a. $0.11 O b. $0.13 O c. $0.07 d. $0.09