An annuity with a cash value of $10 500 pays $900 at the beginning of every three

Question:

An with a cash value of $10 500 pays $900 at the beginning of every three months. The investment earns 11% semi-annually.
(a) How many payments will be paid?
(b) What is the size of the final payment?
Annuity
An annuity is a series of equal payment made at equal intervals during a period of time. In other words annuity is a contract between insurer and insurance company in which insurer make a lump-sum payment or a series of payment and, in return,...