Imagine that you consume coffee at your home with your family, and need to decide how much you should order. Your consumption is 1.4 kg/week, where the price of coffee is 500 TL/kg, where you pay shipment cost of 60 TL per each order to the courier company. The yearly interest rate is 20%. Calculate the amount of ordering to minimize the average annual cost. (note:there are 52 weeks in a year)