Mutate across multiple columns
You can use the across() function inside of mutate() to specify which
columns you'd like to work with, which function to apply to these columns,
and any text that you'd like to add on to the names of the new columns.
Work with imf_data to create newly engineered columns from existing columns.
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Programming with dplyr
Interaktive Übung
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# Multiply as_perc_gdp columns by gdp_in_billions_of_usd
imf_new_cols <- imf_data %>%
mutate(___(.cols = ___,
.fns = ~ .x * ___),
___)