i need help with explanation please thank u

Joker Inc. had 600 units, costing $6 per unit, on hand at August 1. Joker's transactions for the month of August were as follows: a) Calculate the cost of goods sold for August and the ending inventory at August 31 using the LIFO, FIFO, and average cost methods, assuming a periodic inventory system and no shrinkage. b) Calculate the cost of goods sold for August and the ending inventory at August 31, using the LIFO, FIFO, and average cost methods, assuming a perpetual inventory system and no shrinkage. c) Which method gives the highest net income? Why