Please show equations written out

Assume that todays Wall Street Journal is showing the following information for a given Treasury Bill with a $20,000 face value:

Days to maturity: 253

Bid yield: 0.048

Ask yield: 0.044

(a). What is the price that you will have to pay if you were to buy one T-bill from a dealer?

(b). What is the price you will get if you were to sell one T-bill to the dealer?

(c). What is the bid-ask-spread for the T-bill above?

(d). What does a narrow bid-ask-spread indicate?