Mini is a care dealership and lines to maintain a minimum inventory of 10 cars It had an inventory of 10 cars at the end of year 1. It buys 84 cars at the beginning of every week and sells them gradually over the week and has 10 cars left at the end of the week. For simplicty assume that it was able to sell 84 cars each week and there are 52 weeks in a year. What is the average number of cars in inventory? ( first in first out basis)