Cash collected from customers is calculated by taking the total sales revenue and adjusting for the change in accounts receivable. If accounts receivable increases, it means some sales were made on credit and not yet collected. Therefore, Rs. 25,000 (Sales) - Rs. 8,000 (Increase in Receivables) = Rs. 17,000 (Cash Received).

When merchandise is sold on account, the business increases its Accounts Receivable (an asset) and recognizes revenue through Sales. According to the rules of debit and credit, an increase in an asset is recorded as a debit, and an increase in revenue is recorded as a credit. Thus, debiting Accounts Receivable and crediting Sales correctly reflects the transaction.

When goods are given as charity, the 'Purchases' account is credited. This is because the goods were originally acquired for resale, and their removal from inventory for charitable purposes reduces the total cost of goods available for sale. By crediting the purchases account, the cost of these goods is effectively removed from the trading account, and the expense is recorded in the profit and loss account.

When goods are given away as charity, they are no longer available for sale. To adjust the inventory records, the cost of these goods is removed from the Purchases account by crediting it, while the Charity account is debited to record the donation expense.

When a business receives a loan, it increases its cash (an asset) and creates a liability. According to the rules of accounting, the increase in an asset is debited to the Cash account, and the increase in a liability is credited to the specific Loan account, in this case, D. Michael's Loan account.

According to the rules of double-entry bookkeeping, when a payment is made by cheque, the bank balance decreases. Since the bank is an asset, a decrease in an asset is recorded by crediting the bank account.

While cash transactions are recorded in the Cash Book, the Journal Proper is used for transactions that do not fit into specialized subsidiary books like the Sales or Purchase books. Adjustments for discounts, especially those not directly linked to a cash transaction entry, are often recorded in the Journal Proper to ensure accurate ledger posting.

Specialized journals like the Sales Journal are reserved for credit sales of inventory (goods dealt in by the business). The sale of a fixed asset, such as old furniture, is not a regular trading activity and is therefore recorded in the General Journal (or Journal Proper), as it does not fit into the specialized books for inventory or cash transactions.

While specific returns are recorded in the Sales Return Day Book, a credit note is a source document that can be recorded in the General Journal if it does not fit into a specialized subsidiary book, or it serves as the basis for entries in the Sales Return Day Book. In many accounting contexts, the General Journal is the primary place for non-routine adjustments.

The General Journal is used for transactions that do not fit into specialized subsidiary books like the Sales Day Book, Purchases Day Book, or Cash Book. Correcting accounting errors involves non-routine entries that require a narrative explanation, making the General Journal the appropriate place for such adjustments.