Contingent obligation shall be included in calculating the value of the contract. Several contracts that are all related to the same undertaking shall be deemed a single contract for the purposes of this Article. When several contracts are considered as a single contract, the term shall be that of the contract having the longest term, and the sums to fall due shall be the total of all sums to fall due under all single contracts in the group. No contract agreement shall be divided for the purpose of, or that results in, evading the requirements of this Article.
N.C. Gen. Stat. § 159-148