Black, Inc. is an auto parts retailer which uses a perpetual inventory system. The company records its purchases at net cost and sales at full invoice price. Prepare journal entries (no explanations needed) for the following transactions.

10/5: Black purchased 150 Charge-Up batteries on account from White Co.. The total invoice price is $40 per battery ($6,000 total); terms of 2/10,n/30.

10/7: Black returned 20 batteries which had been ordered in error. The amount is to be deducted from the balance due.

10/15: Black sent the balance due to White.