12. Astrik Ltd. expects sales in February of $420,000. Markup on costs is 150%. Astrik expects the following expenses in February: management salaries $24200, salespersons wages $21000, bad debts 2% of sales, office salaries and expenses $12600, advertising 1.5% sales, discount allowed 1% sales, and interest on loan $1000. If EI is $13,500 higher than BI, what is the amount of purchases for February? a. $168,000 b. $181,500 c. $293,500 d. Neither of the above

I know that

Sales at cost

+ Ending Inventory at cost

-Beginning Inventory at cost

= Total Cost of Purchases

and cost of sales = 420,000/(1+1.5)=168,000

but how do I know what Beginning inventory is? It only says ending inventory is 13500 more than beginning inventory.