text: i need guaranteed investment return of 15% on 300,000. any ideas?   i hope that question is not a serious one!  if you are in the u.s., the only "guaranteed" investment return is that of treasuries and even then you can lose to inflation.    there does not exist a guaranteed return of 15%.  finance 101 says that the greater the expected return, the greater the risk.  to achieve 15% requires risk which means it is not a guarantee.  sorry to have to break this to you!