The Zipcar website provides details on membership and mentions a $$7\mathrm{.}00$ monthly membership fee. A car can be rented for an hourly or daily rate. While the actual rate can vary, a car can be rented for about $$9\mathrm{.}00$ per hour, which includes $20$ free miles, or for a $$73$ daily rate, which includes $180$ free miles per day, and a charge of $$0\mathrm{.}45$ per mile for each mile over $180.$

Required:

$1.$ Assume you will take a two$-$day trip to visit some friends over the weekend and you will drive $400$ miles. What is the total cost of this trip?

$2.$ You are trying to estimate your monthly spending on your Zipcar membership. You plan to make four weekly trips to run errands like grocery shopping, going to the pharmacy, etc. Each trip will take about two hours and be about $15$ miles. You will also take a trip over a three$-$day weekend to visit your family and expect the trip will cover a total of $450$ miles. How much do you expect your Zipcar costs to be for the coming month?

$3.$ Identify each car$-$related cost as fixed or variable.

$4.$ Identify each listed item as a competitive advantage or challenge.