The Accuweather Corporation manufactures barometers and thermometers for weather forecasters. In an attempt to forecast its future needs for mercury, Accuweather's chief economist estimated average monthly mercury needs as: N = 500 + 10X

where N = monthly mercury needs (units) and X = time period in months (January 2008= 0). The following monthly seasonal adjustment factors have been estimated using data from the past five years:

Month	Adjustment Factor
January	15%
April	10%
July	20%
September	5%
December	10%

(a) Forecast Accuweather's mercury needs for January, April, July, September, and December of 2010. Fill the seasonal-adjusted forecasts in the blanks below by rounding to the nearest integers.

Month	Adjusted Forecast
January 2010
April 2010
July 2010
September 2010
December 2010

(b) The following actual and forecast values of mercury needs in the month of November have been recorded:

	Year	Actual	Forecast
	2008	456	480
	2009	324	360
	2007	240	240

What seasonal adjustment factor should the firm use for November? (round to the second digit after the decimal)