Question: a ) Recode the change _ 0 4 1 3 variable so it represents the percentage change in circulation between 2 0 0 4 and

a) Recode the change_0413 variable so it represents the percentage change in circulation between 2004 and 2013 as an integer. This will require manipulating the strings in change_0413.
b) Append a new variable to the tibble which contains the average of circ_2004 and circ_2013.
a ) Recode the change _ 0 4 1 3 variable so it

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