You're trying to save $12,771 for the purchase of a new roof on your house. You expect to need the money in 21 years. You're trying to determine how much money you need to deposit today into Bank A (and then, after that, into two other banks: Bank B and Bank C - in sequence), so that you can meet your goal of having your roof paid for. Here's the situation: Bank A is currently paying an annual interest rate of 3% per year - and you expect them to pay this rate for the foreseeable future. You plan to deposit money into Bank A today, and keep it there for the next 6 years. After that, you plan to withdraw all the money from Bank A and deposit it into Bank B - which you expect to be paying an annual idterest rate of 6% per year. You've decided to keep the money invested in Bank B for an additional 10 years. Finally, you plan to move all the money from Bank B to Bank C. You expect that Bank C will be paying an annual interest rate of 3% per year. You plan to withdraw all the money from Bank C, 21 years from today (and pay for your new roof!) How much money do you need to deposit into Bank A today? Enter your answer as a positive value using at least 4 significant digits