a combination of trend and seasonality?

Seho

New member
A manager of a store that sells and installs spas wants to prepare a forecast for January, February, and March of next year. Her forecasts are a combination of trend and seasonality. She uses the following equation to estimate the trend component of monthly demand: Ft = 68 + 4t, where t = 0 in June of last year. Seasonal relatives are 1.17 for January, 1.09 for February, and 1.02 for March. What demands should she predict?
 
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