It is not possible to reliably multiply an investment of 100 to 3000 in the stock market within a month. The stock market is inherently risky and volatile, and attempting to make a large return in a short period of time is often referred to as day trading or speculating. This approach is generally not recommended for individual investors, as it requires a significant amount of time, knowledge, and experience to be successful. Additionally, it is important to remember that past performance is not indicative of future results, and there is always the potential to lose money in the stock market. It is generally more advisable to take a long-term, diversified approach to investing, and to consult with a financial advisor before making any investment decisions.