According to the net value of fund unit share you know, you can calculate your account assets on the announcement date of net value: net value of fund unit share * account share, calculate your current account assets, and then compare them with the input cost. If the current account assets are higher than the input cost, you have made a profit, and vice versa. This is in the absence of cash dividends. If there is a cash dividend, add the cash dividend you get to the current asset market value, and then compare it with your input cost.