What do I do for the percent section on letter b? Please do show work thank you!

Analyze Apple Inc. by segment Segment disclosure by Apple Inc. (AAPL) provides sales information for its major product lines for three recent years as follows (in millions): Segment Year 3 Year 2 Year 1 iPhone $136,700 $155,041 $101,991 iPad 20,628 23,227 30,283 Mac 22,831 25,471 24,079 Services 24,348 19,909 18,063 Other Products 11,132 10,067 Total sales $215,639 $233,715 $182,795 8,379 The Services segment includes sales from iTunes Store, App Store, Mac App Store, TV App Store, iBooks Store, Apple Music, AppleCare, and Apple Pay. The Other Products segment includes sales from Apple TV, Apple Watch, Beats products, iPod, and Apple-branded accessories. a. Prepare a vertical analysis of Year 3 sales. (Round percentages to nearest whole percent.) Segment Year 3 Sales Percent of Total Sales IPhone $136,700 63 % iPad 20,628 Mac 22,831 Services 24,348 Other Products 11,132 11 5 100 % % % Total sales $215,639 b. Prepare a horizontal analysis of the change in sales from Year 1 to Year 3. (Round percentages to nearest whole percent. For those boxes in which you must enter subtractive or negative numbers use a minus sign.) Segment Year 3 Year 1 Increase (Decrease) Amount Percent 34,709 iPhone $136,700 $101,991 $ 20,628 30,283 iPad -9,655 Mac 22,831 24,079 -1,248 Services 18,063 24,348 11,132 Other Products 8,379 6,285 2,753 32,844 Total sales $215,639 $182,795 $ Which product grew the most in sales, in percentage terms, using Year 1 as the base year? Services