Utilize your financial knowledge, give your answer or opinion to the input question or subject . Answer format is not limited.

What is today's price of 15 000 Euro given 15 years ago?
There's often a legal basis to answer this question. For instance, Austria (guessing from your profile) currently uses a 4% Statutory interest rate. You'll need to dig up not just the actual but also the historical rates. Note that you'll want the non-commercial interest rate - some countries differentiate between loans to businesses and loans to individuals.