Wilson moved out of the District's Service Area on June 15, and closed his account.

Wilsons account was current as of April (April's bill was paid, and there account was current as of April).

Wilson's bill for the month of May was $41.16 (Due 6/20)

Wilson's bill for June 1 to June 15 was $16.26 (Due 6/30)

Wilson paid the bill for the month of May on the due date, and the account balance at June 15.

The account shows an overpayment in July.

How much is the overpayment on the account in July ?

Please show your work and explain the reason.