a brief explanation would be very much appreciated

E7-5 The cash receipts journal of Crab Harvest follows: Cash Receipts Journal Page 7 Debits Credits Other Accounts Sales Accounts Sales Post. Date Cash Discounts Receivable Revenue Account Title Ref. Amount Jan. 2 790 40 830 Mandarin Corp. (a) 9 490 490 Big Fish Inc. (b) 19 4,480 Note Receivable (c) 4,000 Interest Revenue (d) 480 30 310 20 330 S. Breakwell (e) 31 4,230 4,230 31 10,300 60 1,650 4,230 Totals 4,480 (f) (g) (h) (i) (j) Crab Harvest's chart of accounts (general ledger) includes the following selected accounts, along with their account numbers: Number Account Number Account 110 Cash 510 Sales Revenue 120 Accounts Receivable 512 Sales Discounts 125 Note Receivable 515 Sales Returns 140 Land 520 Interest Revenue Required Indicate whether each posting reference (a) through (i) should be A check mark () for a posting to a customer account in the accounts receivable subsidiary ledger An account number for a posting to an account in the general ledger. If so, give the account number A letter (X) for an amount not posted 3 Using the sales and cash receipts journals (perpetual inventory system)