Beginging inventory units unit cost purchases:

unit cost $1011121315During the year, Cartersold 1,000 units. It uses a periodic inventory system. 1. Calculate ending inventory and cost of goods sold for each of the following three methods:a. weighted averageb. FIFOc. LIFOThis is what I need help on its hard to figure out and im not a big math fan. I do understand some of it I can't seem to figure out how to calculate the LIFO. :-)