The unpaid balance at the start of a 30-day billing cycle was $ XXXXXXXXXXA purchase of $49.82 was made on day 15. No payment was made during the billing cycle and a late fee of $37 was charged to the...

The unpaid balance at the start of a 30-day billing cycle was $725.38. A purchase of $49.82 was made on day 15. No payment was made during the billing cycle and a late fee of $37 was charged to the account on day 25. Find the unpaid balance at the end of the billing cycle.