You have $10,000 to invest for five years.

a. How long will it take your $10,000 to double in value if it earns 5% annually? (10%)

b. How much additional interest will you earn if the investment provides a 5% annual return, when compared to a 4.5% annual return? (5%)

c. What annual rate has been earned if $1,000 grows into $4,000 in 20 years? (10%)