please use a financial calculator and show your inputs

Arnold learned something very valuable as a teenager from his dad. He was told to invest $1,000 at 12% interest at age 20 and leave it alone until age 65. Arnold's dad knew that one strategy that wealthy people use is to exercise self-discipline to never touch this long-term plan. Arnold is very happy he applied his dad's advice. Approximately how long will it take Amold's savings to grow into $2,000