Record journal entries for the following transactions of Furniture Warehouse.
A. Aug. 3: Sold 15 couches at $500 each to a customer, credit terms 2/15, n/30, invoice date August 3; the couches cost Furniture Warehouse $150 each.
B. Aug. 8: Customer returned 2 couches for a full refund. The merchandise was in sellable condition at the original cost.
C. Aug. 15: Customer found 4 defective couches but kept the merchandise for an allowance of $1,000.
D. Aug. 18: Customer paid their account in full with cash.