Equity Mutual Funds give returns of about 12% over the long term (7 years and above) and Debt Funds usually give returns of about 7% annually. So we take that as an average for our goal projections. You can see the back-tested results of our strategy here.
You can also read about how risky equity mutual fund investments are, here.
Having said that, past performance is not an indicator of future performance so there are no guaranteed returns in any kind of Mutual Funds.