Tina, Noah, and Robert all have investments in non-registered accounts. Each of them has received $40,000 of investment income, but the type of investment income is different for each friend. They all have a 50% marginal tax rate. Assume a federal dividend tax credit of 15.02% and a provincial dividend tax credit of 5.98%. The amount of after-tax investment income received is as follows:  Tina: $20,000  Noah: $23,992  Robert: $30,000 What type of investment income did each friend receive?