Promenade Limousine RentalYou and your friends are planning to go to prom. To rent a limo, it will cost $200 and an additional $25 for refreshments for each passenger. You've already confirmed that you and your best friend will be going. However, your other three friends haven't gotten back to you yet. Each friend (including yourself) will bring along their prom date so the possible number of guests is 4 through 10 (in groups of 2). You need to make a quick budget to split up the potential costs, so you utilize some of your mathematics know-how.For this Performance Task, use these definitions to make sense of the problem and tocalculate your final answers.Promenade Dance - A promenade dance (or prom) is a semi-formal (black tie)dance that is typically held near the end of the senior year.Limousine - A limousine (or limo) is a luxury sedan vehicle generally driven by achauffeur and with a partition between the driver and the passenger compartment.Cost Equation - The formula used to calculate costs is: Total Cost Variable Costs + Fixed CostsVariable costs, as opposed to fixed costs, are those that change based on the amount of somevariable.1. Write a function for the cost where x is the number of passengers. (1 point)2. Cost Identify the domain of this function. (1 point)Domain: { _______ , _______ , _______, _______ }