Samir Kumar Bhandari Department of Math., Bajkul Milani Mahavidyalaya   Department of Math, B.M. Mahavidyalaya, P.O- Kismat Bajkul, Purba Medinipur, West Bengal India   skbhit@yahoo.co.in             JEL Areas: C0 : Mathematical and Quantitative Methods: General A0 : General Economics and Teaching