Treasury bills, or T−bills, are sold in terms ranging from a few days to 26 weeks. Bills are sold at a discount from their face value. For instance, you might pay $990 for a $1,000 bill. When the bill matures, you would be paid $1,000. The difference between the purchase price and face value is interest. A bill for 100 is purchased for 96 three months before it is due. Find: (a) The nominal rate of discount convertible quarterly earned by the purchaser. (b) The annual effective rate of interest earned by the purchaser.