How to remove % sign from end of number in dataframe in R

I was wondering how to find elements that end in % and remove the % sign from those elements?

data <- read.table(text="
COURSE          CLASE  GROUP_A   GROUP_B
algebra         1         25%        8%
algebra         2         35%        9%
number_theory   3         18%        7%
number_theory   4         14%        11%
math_games      5         12%        5%
math_games      6         19%        4%
",h=TRUE)

>Solution :

lapply over the columns removing any % at the end and then convert the types in the data frame to numeric if they should be numeric. No packaes are used.

data |>
  replace(TRUE, lapply(data, sub, pattern = "%$", replacement = "")) |>
  type.convert(as.is = TRUE)

giving:

         COURSE CLASE GROUP_A GROUP_B
1       algebra     1      25       8
2       algebra     2      35       9
3 number_theory     3      18       7
4 number_theory     4      14      11
5    math_games     5      12       5
6    math_games     6      19       4

With dplyr it is similar but we use across:

library(dplyr)

data %>%
  mutate(across(everything(), ~ sub("%$", "", .x))) %>%
  type.convert(as.is = TRUE)