Bonds issued under this act are general obligation bonds of the county for which the full faith and credit and unlimited taxing power of the county are pledged in the event that rental income from the business is not sufficient to retire the debt. T.C.A. § 7-55-111. Before the bonds are issued, however, they must be approved by a three-fourths majority of the county's registered voters. T.C.A. § 7-55-107. The authority for this type of bond issue is found in T.C.A. §§ 7-55-101 through 7-55-116.