You are saving up for your wedding and honeymoon in 4 years' time. You have set aside a target budget of $75,000. Today, you make an investment of $20,000. At the end of this year, you will invest $10,000. You intend to invest $10,000 at the end of each year for the next 3 years (year 2,3 and 4). What interest rate must the investment provide in order for you to achieve your target