Angela is offered to buy a financial security that guarantees to pay $30 every 3 years. The annual interest rate is 9%. Calculate and explain in words all calculations for the following: (a) How much would Angela pay for it today if the first payment will be received today? There will be a total of 20 payments. (b) How much would Angela pay for it today if the first payment will be received in 3 years? Again, there will be a total of 20 payments. (c) How much would Angela pay for it today if every other payment time the payments will be twice as large? I.e., $30, $60, $30, $60, and so on. The first payment will be received today, and there will be a total of 20 payments.