Please explain how you got the answer

The monthly sales for Yazici Batteries, Inc., were as follows: Feb Month Sales Jan 21 Mar 15 Apr May Jun 14 13 18 Jul 15 Aug Sept 17 22 Oct 20 Nov 20 Dec 23 21 This exercise contains only parts b and G. b) The forecast for the next month (Jan) using the naive method = 23 sales (round your response to a whole number). The forecast for the next period (Jan) using a 3-month moving average approach = 21 sales (round your response to two decimal places). The forecast for the next period (Jan) using a 6-month weighted average with weights of 0. 10.0.10, 0.10, 0.20 0.20, and 0.30, where the heaviest weights are applied to the most recent month = 20 3 sales (round your response to one decimal place) Using exponential smoothing with a=0.30 and a September forecast of 18.00, the forecast for the next period (Jan) = 20.63 sales (round your response to two decimal places). Using a method of trend projection, the forecast for the next month (Jan) = sales (round your response to two decimal places)