Need details on how you got the answer please. I cannot use excel only a calculator. I will up vote if work is shown. Just ignore the writing on the paper its the teachers work but i could not understand it.

Problem F-SPS Electronics purchases remote control devices based on the following discount schedule. The expected annual demand is 8,000 units, ordering cost is $25 per order, and holding cost is 20% of purchase price. Find the optimal order quantity and optimal cost