Solve the all parts of given problem:
Problem: A cancer patient is undergoing radiation therapy in which protons with energy of 1.2 MeV are incident on a 0.20-kg tumor.
Part I: If the patient receives an effective dose of 1.0 rem, what is the absorbed dose?
Part II: How many protons are absorbed by the tumor?
I need tutor help to solve the above problem and thanks in advance.