please ooo, fellow ideal nairalander, could you please advice me on the kind of business i can invest my forty thousand naira on and raise to 6% in reture within a month. thanks in advance.

Put it on an investment platform like forex and learn how it works while fund managers manage your investment for you.
thats the simplest and laziest way to make a six% return on your investment.
Note too that there is risk involved so in goin about it find a reputable worldclass forex company to invest with.