The main purpose of this paper is to develop an inventory model under fuzzy approach by considering the effect of inflation and time value of money, to determine the optimal time period for inventory cycle and minimum total average costs. The model is integrated production inventory model developed where; the Demand has a direct linear impact on production rate. The model can be divided into four stages. In the first two stages with original production rate and subsequent change in production rate, inventory level rises. Third stage is time after the accumulation of inventory and before the deterioration starts, where demand which selling price dependent is depreciating the inventory level, while in the fourth stage deterioration occurs, which is considered to follow two parameter Weibull distribution. The back-order is not considered. Hexagonal fuzzy numbers are used to derive optimum solution and defuzzification by graded mean integration representation method. A numerical example is given to demonstrate the applicability of the purposed model and sensitivity analysis is carried out to reveal the impact of change in parameter values.

Coffee is one of the most consumed beverages in the world. It is highly consumed among many parts of India. Various studies concentrate on the effects of consuming coffee and consumer’s behavior in purchasing products related to coffee. Less studies focus on their effect among college students. Therefore, the aim of this study was to determine the coffee consumption habits and the perception of its effect among college students in Mumbai. The study was performed using convenient sampling method with a sample size of 234 students studying in different colleges from Mumbai. This study collected information about the characteristics of the students participated, coffee intake habits and the perception of its effect on consuming coffee. The majority of the students in this study consume coffee. Using factor analysis, the major factors affecting the consumption of coffee on daily basis was identified. The consumption of coffee was more during their important academic activities such as project work or examination days. Due to the burden of exams, students consume coffee to increase their study hours and academic performance.