Question 44111
Let W be the Wachovia investment and C be the CCB investment.

Then 
W>=2000 and W<=14000
C<=15000
W+C<=22000

Set up a coordinate system with vertical axis W and horizontal axis C.

Plot the inequalities of the coordinate system.
Determine the intersection of the equality lines.
I get points at (0,14000) (8000,14000)
(0,2000) and (15000,2000)

You didn't post an interest statement so we can't
tell which combination yields the most interest.

Cheers,
Stan H.