Macroeconomics

[King]

A firm hires labor for $6,000, pays rent of $2,000, buys raw materials for $10,000, earns a profit of $800 and sells its output for $25,000. What is the firm's added value?
a. 1000
b. 15000
c.-800
d.12000
Thanks in Advance

[factor-fiction]

Is this macroeconomics?
Is answer c 800 or -800?
Which answer do you think seems right? It seems to me there's only one of the suggested answers that you can get from these figures but it doesn't feel quite right.

[twix123]

Another homework question?

There are Lies, Damn Lies and Stastistics......or an MP will give a completly different answer!