[R] R bar chart

[farshad goudarzian]

Hello.
Here I attach a microsoft excel data base file and plot image to illustrate
my question.



my code:

ggplot(concretedata, aes(Company, Concrete, fill=
Type))+geom_bar(stat="identity")

As per the attachment plot, the bar chart for different parameters
(Concrete, Company and Type) is presented, but I dont know how to label
each area of my bar plot.

for example, the bottom left area of my chart should show the sum of
concrete provide by company A with type of C30 (16000 m3)
 or the top right area of my plot should present the total concrete volume
of company B with type of C25. (13000 m3)
but I dont know how to show the total concrete of each area

I know  the command is "geom_text", but it doesnt show the sum of concrete
volume, it shows all the numbers of concrete on top of each other.

thanks
best regards