Interest

   There is currently no bank with good interest rates. The idea is for people to INVEST or spend their money, not to save, and even for such money, even if there were high interest rates, they would still not help the budget for 1 year. Just save or postpone the trip. Take advantage of discounts and promotions. The easiest money to make is ... unspent.

   from interest a person can earn, if you have deposited 100 vouchers upwards 3% on average you deposit 1000, at the end of the year they give you BGN 30 more

   By depositing in banks you will not collect. So if you have about 30,000 you can collect a maximum of BGN 1,000 per year, but if you have them you will not be surprised but you will leave immediately. Interest rates have dropped terribly, even most banks have passed below 1%. In the first investment there are options for about 3% -3. 5% depending on the type of deposit. In alpha bank and in bi bi you may also have some with 3% annual interest. Other banks keep interest rates very low.

   There are no banks with good interest rates for short periods, and you probably want to withdraw your money soon. Jar bank at home and so on.

   Unfortunately, the days of 12-3% interest rates passed even before the fall of communism. No, the idea is not for people to invest their money, the idea is that the IMF gives loans to anyone who asks for them, as long as it is a bank. To your questions: 1 - Only in large banks, if possible abroad. 2 - Most likely the percentage remains the same, but you will receive interest on the money already deposited. Of course, if you have paid BGN 100, you will receive BGN 3 for them (say, your interest rate is 3%), at the end of the year. If you deposit another BGN 100, 6 months after you have deposited the first money, you will receive BGN 4.5 (BGN 3 from your first installment, and BGN 1.5 from the second, as they only lasted half a year).