I need help finding (c) LIFO amd the left side for CALCULATION

the 2nd image are the solutions for (A) and (B)

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 LIFO LIFO LIFO SALES LESS COST OF GOOD SOLD GROSS PROFIT (A) Weighted Average Average cost = Total Cost/Units = 15*5 + 35*10 + 50*7.5 + 20*8 / 120 = 960 / 120 = $8 Ending Inventory = 30 Units Units Sold = 120-30 = 90 Selling Price = $15 per unit COGS = 90*8 = $720 El = 30*8 = $240 Sales = 90*15 = $1350 Less: COGS = 90*8 = $720 Gross Profit = $630 (B) FIFO COGS = 15*5 + 35*10 + 40*7.5 = $725 El = 10*7.5 + 20*8 = $235 Sales = 90*15 = $1350 Less: COGS = $725 Gross Profit = $625 (C) LIFO COGS = 20*8 + 50*7.5 + 20*10 = $735 El = 15*5 + 15*10 = $225 Sales = 90*15 = $1350 Less: COGS = $735 Gross Profit = $615 =