The following balances appeared in the books of Fabice on 30 June 20–7:
                                                                                                     $     
Machinery and equipment ........................................... 108,000
Motor vehicles ................................................................   31,000
Trade payables ................................................................    7,800
Balance at bank ..............................................................     3,830
Trade receivables ...........................................................   11,500
Carriage inwards ............................................................        380
Carriage outwards .........................................................        440
Sales ................................................................................ 131,000
Purchases ....................................................................... 101,900
Rent receivable ..............................................................     3,600
Rent payable ..................................................................     8,400
Inventory ........................................................................   13,200
Commission receivable ................................................     1,950
Administration expenses .............................................     9,600
Capital .............................................................................           ?

a. State two reasons why a trial balance is prepared.

b. Prepare a trial balance for Fabice on 30 June 20–7, inserting a figure for the capital account.

c. Name and explain three errors which will not be revealed by a trial balance.