Ineed to know the answers at the first line right but i didn't get four of the other ones right

Iam so stuck. what is the worked out answer for this question?

Which rational number could be graphed between -4 and -5

Angela is buying a dress that is on sale for 20% off. if the original price of the dress is $40.00, how much money is angela saving on the dress? a. $0.80 b. $3.20 c. $32.00 d. $8.00