1. Department of Business Computing, CK Tedam University of Technology and Applied Sciences, Navrongo-Upper East, Ghana
2. School of Management and Economics, University of Electronic Science and Technology of China, Chengdu, China
3. Faculty of Business, Economics and Social-Sciences, University of Hamburg, Hamburg, Germany
4. School of Mathematics, Southwest Minzu University, Chengdu, China
5. Applied Mathematics Department, Faculty of Applied Science and Technology, Koforidua Technical University, Koforidua, Ghana