The startup balances of a trial balance are extracted from the A balance sheet. B ledger. C journal. D source document.

The startup balances of a trial balance are extracted from the ledger, which contains all the accounts with their debit and credit balances.

• B) ledger.

When stock is updated after every purchase and sale transaction, the system of recording is known as Perpetual Inventory. This system continuously tracks inventory balances.

• D) Perpetual Inventory.

A document established by a person known as a subscriber, typically promising to pay a sum of money, is a promissory note.

• C) promissory note.

The main activity of a commercial enterprise is generally focused on buying and selling of goods, often without transforming them significantly, or producing goods and selling them to customers. Option C is the most general and accurate description of a commercial enterprise's core activity.

• C) buying and selling of goods without transformation.

An allowance paid to a worker as a result of his or her sale of goods or services is known as commission. This is typically a percentage of sales.

• B) commission.

Consigned packagings and the value added tax (VAT) are typically added to the base price of goods or services on an invoice.

• B) additions on an invoice.

In accounting, the left side of an account is conventionally called the debit side.

• B) debit balance.

The permanent inventory system is also called Perpetual inventory. This is a system where inventory records are continuously updated.

• B) Perpetual inventory.

The principle which states that for every transaction, there must be at least one debit and a corresponding credit entry is called the Double entry principle. This ensures that the accounting equation remains balanced.

• D) Double entry principle.