When you are facing relative risk problems, you can be dealing with business management, specific mechanical engineering, or even the social calculations for your Psychology or Nursing tasks. It is one of the reasons why the questions that relate to college statistics are so varied. You should take a look at the answers and the different equations that are based on relative risk calculation. Since we take it as "relative", you must pay attention to the proportions and the relativity as it's done in the solutions that you can see below. It will help you to estimate things much easier!