Except in cases of fraud, and provided the contract is fair and reasonable under the circumstances, a contract between two (2) or more corporations having interlocking directors shall not be invalidated on that ground alone: Provided, That if the interest of the interlocking director in one (1) corporation is substantial and the interest in the other corporation or corporations is merely nominal, the contract shall be subject to the provisions of the preceding section insofar as the latter corporation or corporations are concerned.
Stockholdings exceeding twenty percent (20%) of the outstanding capital stock shall be considered substantial for purposes of interlocking directors.