If an amount of money is invested at an annual interest rate of 6%, it doubles every 12 years. if alejandra invests $500, how long will it take for her investment to reach $2,000 (assuming she does not contribute any additional funds)?

Answer asap and if you do you will get brainliest. catherine buys a gallon of ice cream from the store. after taking it home, she eats a fifth of a gallon of ice cream. her sister eats some of the ice cream as well. if two-thirds of the original amount of ice cream is left, then what fraction of a gallon of ice cream did her sister eat?