Let's say you wanted to earn a yield of 8%.
$210,000 x .31524 = $66, 200.4
+$10,500 x 8.55948 = $89, 874.54
Use the tables to find .31524 (which is 8% @ 15 periods for present value of 1) and 8.55948 (which is 8% @ 15 periods for present value of an ordinary annuity of 1)
You would pay a total of $156, 074.94