The answer is 46.
Since the sum of the interior angles of a triangle is always 180,
We can find out angle C by subtracting the other two angles
180-102-32=46
9 x 2 = 18
6 x 3 = 18
and 18 x 1 = 18
Answer: 
Work Shown:

This can be rewritten into 
P = 18,000
R=6%
T=7 years
A = P ( 1 + 1 divided by r) raised to n
Substitute the numbers an u will fin the answer