I am rather taken aback by the fact the you don't realize that you value the business at R10mil. If you value your business at R2.5mil then the investor owns 100% of the business.

I have another concern, investors don't invest their money 'to make a difference'. The term invest means that the investor will get his money back with interest. Think about it, how much money could the investor make (with little risk) by simply putting his R2.5mil in the bank for 5 years, then, how much money could he make on the stock exchange with medium risk. Ok, so you want him to invest his cash in a business that has nothing other than idea....come on, investors become wealthy because they understand risk vs reward. If you want them to risk that kind of money then the reward to them has to be huge.