i need help with this assignment

Fulbright Corp. uses the periodic inventory system. It's beginning inventory had 10 units @ $100, and they made the following purchases, during the year.(listed in chronological order of acquisition):

40 units at $120

70 units at $125

80 units at $130

The sales in units was 120 at $ 180.00 per unit.

Determine the Cost of Goods Sold, Ending Inventory, and Gross Profit for the following 3 methods

FIFO

LIFO

Weighted Average (rounded)