Harold Co. reported the following current year purchases and sales data for its only product.

Date Activities Units Acquired at Cost Units Sold at Retail
Jan. 1 Beginning inventory 145 units @ $11.80 = $ 1,711
Jan. 10 Sales 135 units @$41.80
Mar. 14 Purchase 295 units @ $16.80 = 4,956
Mar. 15 Sales 185 units @$41.80
July 30 Purchase 445 units @ $21.80 = 9,701
Oct. 5 Sales 255 units @$41.80
Oct. 26 Purchase 645 units @ $26.80 = 17,286






Totals 1,530 units $ 33,654 575 units













Harold uses a periodicinventory system.

(a)

Determine the costs assigned to ending inventory and to cost of goods sold using FIFO.

(b) Determine the costs assigned to ending inventory and to cost of goods sold using LIFO.

I don’t know how to get the answer by using “periodic incentory system”.
Hope you guys can helping and show me the steps. Thank you