how much can i earn in pak, if i have a uk degree and masters

If you get a chance for an interview. You will be hired on the spot because of your British accent. :cb:
We desi get impressed with English/American accent very easy. So do not worry, you have a bright future waiting for you in Pakistan. Even if you did not have a foreign degree ,which is also in high demand in Pakistan, specially in private sector , you will get the best job .