(c) Any displaced person eligible for payments under subsection (a) of this section who is displaced from the person's place of business or from the person's farm operation and who elects to accept the payment authorized by this subsection in lieu of the payment authorized by subsection (a) of this section, may receive a fixed payment in an amount equal to the average annual net earnings of the business or farm operation, except that such payment shall not be less than two thousand five hundred dollars nor more than ten thousand dollars. In the case of a business no payment shall be made under this subsection unless the state agency is satisfied that the business (1) cannot be relocated without a substantial loss of its existing patronage, and (2) is not a part of a commercial enterprise having at least one other establishment not being acquired by the state, which is engaged in the same or similar business. For purposes of this subsection, “average annual net earnings” means one half of any net earnings of the business or farm operation, before federal, state and local income taxes, during the two taxable years immediately preceding the taxable year in which such business or farm operation moves from the real property acquired for such project, or during such other period as such agency determines to be more equitable for establishing such earnings, and includes any compensation paid by the business or farm operation to the owner, the owner's spouse or the owner's dependents during such period.