Identify the accounting principles or concepts involved in the following:         (3 marks)

a) Mr. Sreenath, owner of the business, invested Rs 10000 in his business. He is treated as a creditor of the business to the extent of Rs 10000 and his capital account is credited with the amount.

b) All transactions recorded in the books of accounts must have a supporting document in evidence of it.

c) Closing stock is valued at cost price or market price whichever is less.