please show formulas used for execl spreedsheet. Upload by image chegg does not take execl pdf files

4-8. The following table gives the sources of revenues for Microsoft. Microsoft revenues classified by significant product and service (In millions US dollars) Source: Microsoft Annual Report for 2015 2013 2014 2015 Microsoft Office Server Products and Tools Windows PC operating system Xbox Phone Surface Other 22,995 15,408 17,529 7.100 615 853 13,349 24,323 17.055 16,856 8,643 3,073 1,883 15,000 23.538 18,612 14.826 9,121 7,702 3,900 15,881 (a) Add a row at the bottom for the total revenues. Use a function and the Fill operation. (b) Use Auto Fill to show the predicted amounts for 2016, 2017 and 2018 for each category, assuming a linear trend. Use Fill to obtain the total revenues projected for these years