R calculating scores with mutate

library(tidyverse)
# load the data
df <- read_csv("https://pastebin.com/raw/1yJ5Xsaa")
# calculate score with mutate
df %>%
  mutate(sum_goi = rowSums(df[2:7])) %>% 
  mutate(score = round(.$exam/100*50+.$sum_goi/60*50,1))
## # A tibble: 11 x 10
##    name   goi1  goi2  goi3  goi4  goi5  goi6  exam sum_goi score
##    <chr> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl>   <dbl> <dbl>
##  1 a         0     0     4     1     4     5    39      14  31.2
##  2 b         4     4     4     4     6     0    58      22  47.3
##  3 c         8     5     4     6     8     5    78      36  69  
##  4 d         0     0     4     7    10     5    97      26  70.2
##  5 e         6     2    10     8     8     8    78      42  74  
##  6 f         4     0     3     5     7     5    68      24  54  
##  7 g         6     3     2     5     6     6    58      28  52.3
##  8 h         7     4     9    10     9    10    87      49  84.3
##  9 i         6     3     6     3     5     2    48      25  44.8
## 10 j         6     0     3     6     8     0    78      23  58.2
## 11 k         4     1     0     3     5     4    48      17  38.2