Answer: 7 years
Step-by-step explanation:
It's $18,400, then subtract the $10,000 that her aunt gave her. Thats $8,400. Since she gets 100 a month divide 8400 by 100 and you get 84 months. There are 12 months in a year so divide 84 by 12 and you get 7. I think it's right.
