Can anyone help with this question? I've been trying for a while and can't get it. I put in dummy answers so it would display the full problem. Thank you!

Sales of Volkswagen's popular Beetle have grown steadily at auto dealerships in Nevada during the past 5 years (see table below). Using exponential smoothing with a smoothing constant (a) of 0.30 and a starting forecast of 420.00, the following sales forecast has been developed: Year Sales Forecasted Sales 2005 2006 2007 2008 2009 460 502 520 420.00 432.00 453.00 473.10 500.97 566 584 The MAD for a forecast developed using exponential smoothing with a = 0.30 is 70.59 sales (round your response to two decimal places). Forecasted sales for years 2006 through 2010 using exponential smoothing with a = 0.60 and a starting forecast of 420.00 are (round your responses to two decimal places): Year 2005 2006 2007 2008 2009 2010 Forecasted Sales 420.00 444.00 478.80 503.52 541.01 566.80 The MAD for a forecast developed using exponential smoothing with a = 0.60 is 48.93 sales (round your response to two decimal places). Forecasted sales for years 2006 through 2010 using exponential smoothing with a = 0.90 and a starting forecast of 420.00 are (round your responses to two decimal places): Year 2005 2006 2007 2008 2009 2010 Forecasted Sales 420.00 456.00 497.40 517.74 561.17 581.72 The MAD for a forecast developed using exponential smoothing with a = 0.90 is 35.94 sales (round your response to two decimal places)