(4) The contracting officer may provide a computation method to adjust the contract price to reflect the contractor’s actual increase or decrease in wages and fringe benefits (combined) to the extent that the increase is made to comply with, or the decrease is voluntarily made by the contractor as a result of incorporation of, a new or revised wage determination at the exercise of the option to extend the term of the contract. Generally, this method is appropriate for use only if contract requirements are predominately services subject to the Service Contract Labor Standards statute and the construction requirements are substantial and segregable. The methods used to adjust the contract price for the service requirements and the construction requirements would be similar.