You invested $1,000 four years ago. During the four years, you earned annual interest (rate of return) of 5% in year 1, 20% in year 2, 15% in year 3, and 10% in year 4. What is the value of this investment today?

The sum of $1,000 is deposited into an account paying 10% annually. If $500 is withdrawn at the end of year 1 and $300 is withdrawn at the end of year 2, how much then remains in the account?