Ok so you know that their is 200 people and and their is three iteams.

Then you know that 12% of the people who took the servey have all the iteam and 2.5% have none of the iteam so you need to find how many people have all and none of the iteams then you subterct the sum of any people have all and none of the iteams form the 200 people you will know how many people have one of the three iteams.

Hope this helpðŸ˜„