Code a statement that calls a method named CalculateSalesTax, adds the result of this method to a variable named subtotal, and stores the result in a variable named total. Assume that the CalculateSalesTax method accepts the subtotal as a parameter, and use the this keyword to indicate where the method can be found?

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a manufacturer of printed circuit boards uses exponential smoothing with trend to forecast monthly demand of its product. at the end of december, the company wishes to forecast sales for january. the estimate of trend through november has been 200 additional boards sold per month. average sales have been around 1000 units per month. the demand for december was 1100 units. the company uses α = 0.20 and β = 0.10. make a forecast including trend for the month of january.