Hi, I am making the assumption that the 10000 dollars is included as income in the 18000. No tax payable. If the 10000 dollars profit were to push you above the tax free threshold, then tax would be payable at your marginal rate , for the amount you are over the tax free threshold.
Simplest way to think about it , the 10k is income[no cgt discount as only held for 2 months], and is treated as such. Not treated any differently from income you might have got from working. cheers
