Six months ago $,$ Emily borrowed $$1500$ from Alex and planned to oya back in three payments. The payments were to be made in $4,8$and $,12$ months after borrowing the money $.$ Each payment include the principal of $$509$ and annual simple interest at the rate of $10\%$ from the date of agreement. Today $,$ Emily is asking Alex to accept the sum of two months from now instead of remaining debr. What should be the amount of this lump sum payment?