The cash balance in Amalia’s account with her stockbroker earns

The cash balance in Amalia€™s account with her stockbroker earns interest on the daily balance at an annual rate of 4%. Accrued interest is credited to her account every six months€”on June 30 and December 31. As a result of the purchase and sale of securities from time to time, the account€™s balance changed as follows:
The cash balance in Amalia€™s account with her stockbroker earns

What interest was credited to Amalia€™s account on June 30? The brokerage firm includes interest for both January 1 and June 30 in the June 30 payment. Assume that February had 28 days.