REFUNDING BONDS.

(a) Refunding bonds of the district may be issued to refund and pay any outstanding bonded indebtedness of the district, including assumed bonded indebtedness.

(b) The refunding bonds must be issued in the manner provided for other bonds of the district except that an election is not required.

(c) The refunding bonds may be:

(1) sold and the proceeds applied to the payment of outstanding bonds; or

(2) exchanged in whole or in part for not less than a similar principal amount of the outstanding bonds plus the unpaid, matured interest on those bonds.

(d) The average annual interest cost on the refunding bonds, computed in accordance with recognized standard bond interest cost tables, may not exceed the average annual interest cost so computed on the bonds to be discharged out of the proceeds of the refunding bonds, unless the total interest cost on the refunding bonds, computed to their respective maturity dates, is less than the total interest cost so computed on the bonds to be discharged out of those proceeds. In those computations, any premium required to be paid on the bonds to be refunded as a condition to payment in advance of their stated maturity dates shall be taken into account as an addition to the net interest cost to the district of the refunding bonds.