An investor buys a 180-day T-bill (matures in 180 days) at a discount of 0.5 (0.50%). The investor's actual annual rate of return on this investment is (hint: T-bills are quoted on actual/360 basis but annual returns are calculated using 365 days; you need to figure out the cash price first) 1. 0.5000%. 2. 0.5045%. 3. 0.5082%. 4. 0.5124% 5. 0.5252%