The question reads:

Due to previous tunneling experience, the firm estimates a cost of $18,000 per meter for boring through this type of rock and constructing the tunnel according to required specifications. If management insists on a 30% profit, what will be their minimum bid to the nearest thousand.

The sides are 1200m, 1600m, 330.3m

Attached is the picture of the triangle that I worked out.

http://i56.tinypic.com/m93ltg.jpg

If someone can explain how to continue on from here that would be fantastic.

I had to use the cosine law to get the 330.3m, so I thought it would be relevant to post here.

-- Thanks