Finance-Please Answer

-What annual rate of return is earned on a $1,000 investment when it grows to $1,800 in six years?

-How long will it take $2,000 to reach $5,000 when it grows at 10 percent per year?

-At age 25 you invest $1,500 that earns 8 percent each year. At age 40 you invest $1,500 that earns 11 percent per year. In which case would you have more money at age 65?

-What annual rate of return is implied on a $2,500 loan taken next year when $3,500 must be repaid in year 4?