Why not consider on the basis of the last 20 year's return trend reflected through 4 investment options.
Well, So if you had invested Rs. 1 Lakh in 2000 - in FD which is the general investment option chosen by almost every individual could have generated a return @ CAGR of 6.33% considering a 6% compounded annual interest rate.
If you had invested in the share market according to weights of Nifty 50, you could have generated the return @ CAGR of 11.26% and according to weights as per SENSEX, it could have been 11.67%.
Beyond this, if you had invested in GOLD, you could have generated a return @ CAGR of 13.51% in 20 years. So you can consider this as one of the bases for investment decision-making.