Load the TopGrossingAlbumR.txt file into R and store it as a data frame. Delete the TotalCertified- Copies and ClaimedSales variables from the data frame.

(a) Use the as.Date() function to convert the release date variable into numeric data. Report the release dates listed for the 3 highest grossing albums in Rs default date formatting. What is this value telling you? How does it compare to the corresponding values in SAS?

(b) Create a variable for the days since release of the album. In addition, use the ifelse() function to create a new variable called Era (which should be included as part of the existing data frame). If the release date occurred before 1990, the value of Era should be Classic, whereas if the release date was 1990 or later, it should get a value of Modern. Print the data frame and report the output.

Album	Artist	ReleaseDate	TotalCertifiedCopies	ClaimedSales	Genre

1	Thriller	Michael Jackson	November 30, 1982	46.3	65	Pop
2	Back in Black	AC/DC	July 25, 1980	26.1	50	Rock
3	The Dark Side of the Moon	Pink Floyd	March 1, 1973	24.2	45	Rock
4	The Bodyguard: Original Soundtrack Album	Various Artists	November 17, 1992	27.4	44	Soundtrack
5	Bat Out of Hell	Meat Loaf	October 21, 1977	21.5	43	Rock
6	Their Greatest Hits (1971-1975)	Eagles	February 17, 1976	32.2	42	Rock
7	Saturday Night Fever: The Original Movie Sound Track	Various Artists	November 15, 1977	20.6	40	Soundtrack
8	Rumours	Fleetwood Mac	February 4, 1977	27.9	40	Rock
9	Come On Over	Shania Twain	November 4, 1997	29.6	39	Country
10	Led Zeppelin IV	Led Zeppelin	November 8, 1971	29.0	37	Rock
11	Bad	Michael Jackson	August 31, 1987	21.3	34	Pop
12	Alanis Morissette	Jagged Little Pill	June 13, 1995	24.4	33	Rock
13	Falling Into You	Celine Dion	March 8, 1996	20.2	32	Pop
14	Sgt. Pepper's Lonely Hearts Club Band	The Beatles	May 26, 1967	13.1	32	Rock
15	Hotel California	Eagles	December 8, 1976	21.5	32	Rock
16	Dangerous	Michael Jackson	November 26, 1991	17.6	32	Pop
17	Dirty Dancing	Various Artists	August 4, 1987	17.9	32	Soundtrack
18	21	Adele	January 24, 2011	25.3	31	Pop
19	Let's Talk About Love	Celine Dion	November 14, 1997	19.3	31	Pop
20	1	The Beatles	November 13, 2000	22.6	31	Rock
21	The Immaculate Collection	Madonna	November 9, 1990	19.4	30	Pop
22	Abbey Road	The Beatles	September 26, 1969	14.4	30	Rock
23	Born in the U.S.A.	Bruce Springsteen	June 4, 1984	19.6	30	Rock
24	Brothers in Arms	Dire Straits	May 13, 1985	17.7	30	Rock
25	Titanic: Music from the Motion Picture	James Horner	November 18, 1997	18.1	30	Soundtrack
26	Metallica	Metallica	August 12, 1991	21.2	30	Metal
27	Nevermind	Nirvana	September 24, 1991	16.7	30	Grunge
28	The Wall	Pink Floyd	November 30, 1979	17.6	30	Rock
29	Supernatural	Santana	June 15, 1999	20.5	30	Rock
30	Appetite for Destruction	Guns N' Roses	July 21, 1987	21.6	30	Metal