Life-leech payday lenders offers 7-day loans at 333% APR compounded daily.

Furthermore, if you wish to roll-over your debt, without repayment, you may do so paying an additional 13% effective weekly rate (EWR).

This amount would be on top of the agreed loan rate.

If you were to borrow $2600.69 and held it for 18 months, without ever paying the principal, what would be your balance owing?

You may assume 365 days and 52 weeks in a year. Please give your answer in dollars, eg 10000 for an outstanding loan balance of $10,000

Answer = ??