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The following is the actual demand data for a FOUR season product. The seasonal indexes are as follows: s1 = 09; s2 = 1.4; s3 - 1.1; s4 = 0.6 You are to de-seasonalize the data and enter b, the coefficient oft only in the equation F-d=bit + bo, where F4-d is the de-seasonalized demand forecast of period t. Hint: You have to first deseasonalize the given data before constructing your regression model Round your answer to TWO places of decimal t At 1 20.16 27.72 2. 3 21.12 4. 17.76 5 20.7 6 39.76 7 30.58 8 00 16.92