Please solve problem #4 with detailed steps, thank you

Problem 4: Write a function with the header function billTot -myBillcalc (guests,bill) The function should take two inputs where "guests" stands for the number of guests on a bill, and "billP stands for the total amount of the bill. The restaurant mandates 18% gratuity when there are 6 or more guests. If there are fewer than 6 guests, calculate the bill total assuming a 15% gratuity. Assume that tax is already included in the bill, and that gratuity is calculated as a percentage of the bill including tax. ME 202: HW 4 Page 1/2