Please, Help answer this question. Is was answered here, but it is wrong. Thank you

A manufacturer produces bicycles. Special screws are produced within the plant. Four special screws are necessary for each bicycle. A total of 1200 bicycles are made each year; the total set-up cost for machinery is $15, while the storage cost is 10% and the cost of a screw is $0.30. There are 240 working days per year, and 960 screws per day can be made (2 screws per minute X60 minutes X8 hours). A) Calculate the EOQ assuming instantaneous receipt. B) Calculate the EOQ assuming non-instantaneous receipt