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Handphone is one product of technology that has changed the behaviour of human communication by penetrating space and time. Widespread mobile phone product will cause rapid competition between the mobile market, so it is important for cellphone companies to find out how many products will be sold in the future. A company can minimize the risk of unavailability of product stocks and prevent customers from running to other companies by optimizing marketing and sales to get maximum provit. To look for optimal marketing and sales strategies, this study applies the fuzzy time series method which is very useful for the decision making process by combining the analysis of science in the field of computers and statistics that can be used in forecasting sales results. As for the results of the application of fuzzy time series, it is expected that the company can obtain information on sales forecasting of its products to be used as reference material. After matching the simulation results with real in the field, it can be seen that the fuzzy time series cheng method for forecasting the sales of handphones from Indophone Pamekasan uses 60 monthly sales data from January 2014 to December 2018 with the Vivo brand yielding 398.92 and MAPE value = 8.18644%, with the Advan brand give the results of 340.27 and MAPE value = 7.813559%.

Forecasting of Vivo and Advan Handphone Sales Using Cheng Fuzzy Time Series Method