Some small businessmen do not maintain the complete books of account. Why?

Margin is a:

The system is economical as lesser number of books need to be maintained. It is the advantage of:

Statement of affairs is similar to:

The gross profit measured as a percentage of selling price is:

Margin and mark-up measures the gross profit as:

Which one is a NOT a mixture of single entry?

Accounts under this system are not acceptable to tax authorities.

Profit or loss under this system is only an estimate. This system is:

The number of times a business replaces its stock in a given period of time.