Darren purchased $250 000 in 364-day T-bills 315 days before maturity to yield 2.86%. After holding it for 120 days, Darren sold the T-bill for a yield of 3.25%.
a) How much did Darren pay for the T-bills?
b) When Darren sold the T-bills, what rate of return (per annum) did he get on the investment?