John has two jobs. For daytime work at a jewelry store he is paid $15,000 per month, plus a commission. His monthly commission is normally distributed with mean $10,000 and standard deviation $2,000. At night he works as a waiter, for which his monthly income is normally distributed with mean $1,000 and standard deviation $300. John's income levels from these two sources are independent of each other.

The probability is 0.10 that John's commission from the jewelry store is more than how much in a given month?Round your answer to the nearest dollar.

Please can you show me how's its done. Thank you.