I need help finding (A) weighted average and (B) FIFO

NAME: COST PROBLEM INFO ACT UNITS PU BI 15 $5.00 PUR 35 $10.00 PUR 50 $7.50 PUR 20 $8.00 TOTALS 120 Ending inventory is 30 units and selling price is $ 15 pu. Calculate of goods sold and ending inventory using the 3 methods below: A WEIGHTED AVERAGE COGS COST OF GOOD SOLD ENDING INVENTORY FOR CALCULATIONS ACT UNIT PU COST BI PUR PUR PUR TOTALS per unit WA SELLING PRICE IS $15.00 PER UNIT SALES $ LESS COST OF GOOD SOLD GROSS PROFIT $ COGS WA WA B. COGS FIFO COST OF GOOD SOLD ENDING INVENTORY COGS FIFO FIFO FIFO $ SALES LESS COST OF GOOD SOLD GROSS PROFIT C. COGS LIFO COST OF GOOD SOLD ENDING INVENTORY COGS EI LIFO LIFO LIFO SALES LESS COST OF GOOD SOLD GROSS PROFIT