Incomplete records

A sole trader’s business made a profit of $32,500 during the year ended 31 March 20X8. This figure
was after deducting $100 per week wages for himself. In addition, he put his home telephone bill
through the business books, amounting to $400 plus sales tax at 17.5%. He is registered for sales tax
and therefore has charged only the net amount to his statement of profit or loss and other
comprehensive income.
His capital at 1 April 20X7 was $6,500. What was his capital at 31 March 20X8?

A $33,730
B $33,800
C $38,930
D $39,000

Could you explain that question please?