Projected returns are driven by the rate of returns of its underlying investments, net of all expenses. The math on the projected rate of returns is quite straightforward: GO+ daily earnings are the daily returns from the underlying fund, minus fees charged by the underlying fund managers.
The Total Expense Ratio (TER) for the fund includes the Management Fee charged by the Fund Manager, as well as other expenses incurred by the Fund (e.g., custody, marketing, compliance, shareholder services); as the TER includes fixed costs, it may vary slightly depending on the size of the fund.