Assume you have a 65 W, 15-inch laptop. If your daily laptop usage is around 6 hours. a) How much energy your laptop consumes annually? b) How much natural gas is required per year to allow for your computing habits (assume a combined cycle power plants with 60% conversion efficiency, every 1 m of natural gas produces 11 kWh of thermal energy)? c) How much does your computer's energy consumption cost you per year (assume kWh price of 31 fils)?