Duration and cost of projects

It is commonly spoken that new languages and methodologies
decrease time and cost for developing.
( And maybe move cost to a support stage, but it is not the question)

What are the practical estimated time and cost of projects now?
Very approximately.

Maybe in this format:

Changing an appearance
of the main Web page xxx hour $xxx

Implementing intranet for 100 user xxx man*day $xxx
in 5 metropolitan location

Sergey.