If you can triple your money in 23 years, what is the implied rate of interest? 

If you receive $329 at the end of each year for the first three years and $803 at the end of each year for the next three years. What is the present value? 

Assume the interest rate is 10%. Say, you deposit $2,808 in a bank for 16 years. What is the amount you will have in the bank at the end of 16 years if the interest of 6 % for the first 7 years and interest of 9 % for the remaining years?