In her wallet, Tasha has 12 bills. Six are $1 bills, two are $5 bills, three are $10 bills, and one is a $20 bill. She passes a volunteer seeking donations for a charity and decides to randomly select one bill from her wallet and donate it. Determine

a) The probability that she selects a $5 bill.

b) The probability that she does not select a $5 bill.

c) The odds in favor of her selecting a $5 bill.

d) The odds against her selecting a $5 bill.