Answer:
b. 87N
Step-by-step explanation:
Start by looking at the picture I attached you. As you can see in the diagram of the left, the weight=mg has one component in the x-axis and another in the y-axis. The normal force is directly over the y-axis, so we dont have to worry about the forces on the x-axis. Now, take a look at the diagram of the right, using it, we will be able to find the weight over the y-axis with trigonometry identities:


Now applying newton's second law:

There is no acceleration in this case, so a=0

Solving for N:
