In computing for the purposes of this paragraph, the aggregate amount of indebtedness evidenced by bonds and notes of the dormitory authority issued pursuant to this section, there shall be excluded the amount of such indebtedness represented by such bonds or notes issued to refund or otherwise repay bonds or notes, provided that the amount so excluded under this clause may exceed the principal amount of such bonds or notes that were issued to refund or otherwise repay only if the present value of the aggregate debt service on the refunding or repayment bonds or notes shall not have at the time of their issuance exceeded the present value of the aggregate debt service of the bonds or notes they were issued to refund or repay, such present value in each case being calculated by using the effective interest rate of the refunding or repayment bonds or notes, which shall be that rate arrived at by doubling the semi-annual interest rate (compounded semi-annually) necessary to discount the debt service payments on the refunding or repayment bonds or notes from the payment date thereof to the date of issue of the refunding or repayment bonds or notes and to the price bid therefor, or to the proceeds received by the dormitory authority from the sale thereof, in each case including estimated accrued interest.
N.Y. Pub. Auth. Law § 1689-A