How to calculate percentage from each row of two different columns in R -


please let me know how calculate percentage row wise in r.as i'm using prop.table function not giving me solution 

empid        presentdays        empid      absentdays   1              5                1             10   2              2                2              4   3              6                3             12

i want calculate percentage respect each empid performance

empid         presentdays       empid      absentdays    perfom%   1                 5             1          10            50   2                 2             2           4            50

how in r i've tried prop.table() function doesn't work

assuming dataframe called df:

df$perform <- df$presentdays/df$absentdays*100

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