How to get frequencies with decimals

tidyverse
#1 
data %>%
 group_by(nationality)%>%
    summarise(n=n()) %>%
  mutate(freq = paste0(round(100*n/sum(n),0), "%"))

I am runnig the code able and some of the results are 0%, I believe this is supposed to be a decimal. What can I add to this code to output decimals?

#2

modify the number pasted to round() is enough, e.g.:

data %>%
 group_by(nationality)%>%
    summarise(n=n()) %>%
  mutate(freq = paste0(round(100*n/sum(n),4), "%"))
#3

Thank you, that was helpful

#4

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