You also need to see how much Duke will cost when your sister has graduated. If you have to pay 40% of the cost when she is there, how much is it when it is just you in college? Can your parents pay for all 4 years?
You also need to see how much Duke will cost when your sister has graduated. If you have to pay 40% of the cost when she is there, how much is it when it is just you in college? Can your parents pay for all 4 years?