Most funds have a single price, which is the same when you buy the fund or sell it. The price of a single-priced fund is known as the Mid or Nav (Net Asset Value) price, and is based on the mid-point between the buying and selling prices of the fund’s assets.
The price of a single priced fund is shown as the Nav Price on the rplan fund factsheet:
With a dual priced fund, the fund has two different prices: the price at which you buy the units, known as the Offer price, and the price at which you sell units, known as the Bid price. The difference between these prices is called the spread. Typically, the Offer price is higher than the Bid price, creating the spread. The spread is supposed to account for the difference between the buying and selling prices that the fund manager pays when buying and selling assets, it also protects the fund’s existing investors from the cost of other investors buying and selling units in the fund. The spread may also include profit margin for the fund manager.
If a fund is dual priced, you will see the Offer and the Bid price displayed in the rplan Fund Factsheet as so: