The Fowler Martial Arts Academy trains young boys and girls in self-defense. Joan Fowler, the owner of the academy, notes that monthly revenue is higher when school is in session but quite low when school is out (because many children are away on vacation or at summer camp). She has researched revenues for the past four years and obtained the information shown in the Table for Problem 11-39.
Decompose Joan€™s data by using a multiplicative model. Use the model to forecast revenues for year 5. Comment on the validity of the model.

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MONTH January February March April May June July August September October November $87,705 $87,815 $86,693 88,581 December YEAR 1 YEAR2 YEAR 3 YEAR4 S59,042 $57.495 $56.583 S55,658 $62,659 $62,622 $66,438 S67,164 S22,879 $24,273 $27,766 $27,795 $29,946 $30,492 $31,600 $30,667 $26,839 $28,237 $29,589 31,962 $19,134 $17,893 $20,115 $21,096 S20,051 $21,126 $19,324 $22,778 S19,625 $22,876 S23,486 $23,144 $19,925 22.641 $24.719 $26,601 $58,435 $60,796 $60,666 $61,385 $77,430 $78,7 80,056 $81,048