Actually, you are right, investing in mutual funds are all about the price of shares and the number of shares, the more shares you have and at a cheaper price you get, the better the possible returns.
The illustration that I gave was to give a clear and simple picture about how mutual funds work.
In an ideal scenario, your money will grow in a compounding way provided that you will not redeem sooner or later. However, in reality, it doesn't work that way because of the fluctuations, the NAVPS could either go all the way up or down anytime but for illustration's sake (keeping the NAVPS and rate of return fixed to make it simple), we could compute it in a compounding way.
A much more realistic approach in computing returns (but still isn't that accurate) is to compute the growth/loss every month based on the rate of return. It's still isn't accurate because mutual funds are cost averaged, meaning the return will be based on the average of the gains and losses over a period of time.
The simplest way to compute for the gain is to invest and not add any amount. In that way, you could simply multiply the amount invested with the rate of return over a period of time and add the initial investment and the rate of return. It basically follows the simple interest formula. But since in reality people are investing either in a fixed interval or anytime and the rate of returns fluctuates, it makes calculations complicated if we will base it on the rate of return.
The simplest way to compute for the growth is to multiply the number of shares to the current NAVPS and subtract the total investment (initial investment + additional investments).




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