Sally's aunt put money in a savings account for her on the day Sally was born. The savings account pays interest for keeping her money in the bank. The ratios below represent the number of years to the amount of money in the savings account. After one year, the interest accumulated, and the total in Sally's account was $312. After three years, the total was $340. After six years, the total was $380. After nine years, the total was $430. After 12 years, the total amount in Sally's savings account was $480.