help please im confused

At times of high energy demand, known as "peak demand," it's common for energy operators to turn on so-called "peaker plants" to satisfy that demand. Often, these peaker plants run on natural gas which means that natural gas is burned to generate thermal energy, and that thermal energy is used to create high-pressure steam to run a turbine that spins and generate work. The cost of natural gas is currently around $0.78 per kilogram. Consider a gas power plant that heats steam at 2, 004 F and cools it down at 61. F. Suppose that the power plant's theoretical maximum efficiency is about 2 times its actual operating efficiency, and it produces about 12 k Wh of thermal energy to heat the steam for each kilogram of natural gas it burns. We define the "cost efficiency" of such a plant as the quantity of work it outputs divided by the corresponding cost in dollars of gas it needs to consume to produce that work. What is the cost efficiency of this gas power plant in k.Wh per dollar