Finance: Compound interest

Lessons

1. Bianca deposits $1,000 in a savings account with an annual interest rate of
   12%. How much money will she have in 20 years, if the interest is compounded:
   1. daily
   2. monthly
   3. quarterly
   4. semi-annually
   5. annually
2. A $1000 investment, compounded quarterly, doubles in value over a period
   of 8 years. Find the interest rate per annum.