Quote:
I haven't tried anything because im lost
The question for me is why this is so. The task is really simple and it should be solvable even for absolute beginners. If you start from a "Hello World" program, which is probably presented first in every beginner's book or tutorial, this should also be usable here as a basis.
After that it would make sense to read the task and to think about a sequence for the single steps.
Simply programming on the fly would certainly not be the right strategy. Writing down the steps in the right order should always be done first on a piece of paper or a simple text file. It is best to write down one line for each small step, which you can also leave directly as a comment in the program.
Obviously, the first step is to enter the estimated building costs.