The chart of accounts of Lopez Company includes the following selected accounts.

112 Accounts Receivable.... 401 Sales
120 Merchandise Inventory... 412 Sales Returns and Allowances
126 Supplies......... 505 Cost of Goods Sold
157 Equipment........ 610 Advertising Expense
201 Accounts Payable

In July the following selected transactions were completed. All purchases and sales were on account.

The cost of all merchandise sold was 70% of the sales price.
July 1 Purchased merchandise from Fritz Company $8,000.
2 Received freight bill from Wayward Shipping on Fritz purchase $400.
3 Made sales to Pinick Company $1,300, and to Wayne Bros. $1,500.
5 Purchased merchandise from Moon Company $3,200.
8 Received credit on merchandise returned to Moon Company $300.
13 Purchased store supplies from Cress Supply $720.
15 Purchased merchandise from Fritz Company $3,600 and from Anton Company $3,300.
16 Made sales to Sager Company $3,450 and to Wayne Bros. $1,570.
18 Received bill for advertising from Lynda Advertisements $600.
21 Sales were made to Pinick Company $310 and to Haddad Company $2,800.
22 Granted allowance to Pinick Company for merchandise damaged in shipment $40.
24 Purchased merchandise from Moon Company $3,000.
26 Purchased equipment from Cress Supply $900.
28 Received freight bill from Wayward Shipping on Moon purchase of July 24, $380.
30 Sales were made to Sager Company $5,600.

Instructions

(a) Journalize the transactions above in a purchases journal, a sales journal, and a general journal. The purchases journal should have the following column headings: Date, Account Credited (Debited), Ref., Accounts Payable Cr., Merchandise Inventory Dr., and Other Accounts Dr.

(b) Post to both the general and subsidiary ledger accounts. (Assume that all accounts have zero beginning balances.)

(c) Prove the agreement of the control and subsidiary accounts.