The need for increasing and performance the agility of a business process, along with different cost control measures is currently playing an important role in the future of Business Process as a Service into the Market of Cloud Computing Services. The operational scarcities of capital and high cost pressures force the industry to seek out innovative engagement standards to accomplish plans and goals. In this paper, based on the formal Total Cost of Ownership model for Cloud Computing Services from previous study, we provide literature review, analyze, develop a mathematical approach of Total Cost of Ownership and evaluate a case study of Business Process as a Service. The implementation of this perspective could eliminate the necessitate of capital investments while reducing operational expenses, and rating differently to generate outstanding results for Cloud Service Providers and benefits for the cloud users.