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The following data in the sales in ice-cream was collected in the past 2 years in each quarter. a. Find out the seasonal index for 1stQ to 4thQ using the above data. (15 marks) b. Find out the de-seasonalized value for 1stQ to 4thQ of 2021. (6 marks) c. According to your answer above, which quarter has the highest sales after taking away the seasonal effect? ( 2 marks) The following data in the sales in ice-cream was collected in the past 2 years in each quarter. a. Find out the seasonal index for 1stQ to 4thQ using the above data. (15 marks) b. Find out the de-seasonalized value for 1stQ to 4thQ of 2021. (6 marks) c. According to your answer above, which quarter has the highest sales after taking away the seasonal effect? ( 2 marks)