You are the Director of Procurement and had oversight for the sourcing processes regarding a turnkey project that resulted in the award of a contract for the design, construction, installation, testing and commissioning of a new electricity transmission substation at APAM. The civil works lot within the entire programme of works approved, leading to the award costs Gh2.5m. the contractor is currently onsite and had initiated a change request (CR) in respect of additional works that will expand the civil works scope. The said CR had gone through the project management change control governance regime and the said CR had been approved from a technical perspective. REQUIRED: a) Assuming that the total project cost was Ghs10.07m, determining the approving authority for the tender outcome/recommendation. b) From a commercial perspective, and as the Procurement lead, outline the cause of action(s) and the methodology you would use to ascertain the total cost of the approved CR from the Project Change Control Board.