gm - {Total 25 marks) I. Annual sales of company 'Y' from 2017 - 2021 as foliows: Annual sales Year (000) a) Using 2019 as the base year {=100}, nd the index numbers for sales of the company 'X' over the whole period. Show step-by-step calculations. (2 marks x 5 = 10 marks) b) If the index is 99.7 for year 2017, calculate the sales of the base year. (3 marks) c) If the index is 104.3 for year 2020, calculate the sales of the base year. (3 marks) d) Using appropriate examples, explain the importance of Consumer Price Index (CPI). (9 marks)