The correct option is C 100°
We know that in a rectangle, each angle is equal to 90∘.
So, each of the angles (x+30)∘ and (y+50)∘ need to be equated to 90∘. This gives us the following equations:
Solving these equations, we get x=60∘ and y=40∘ respectively and therefore, x+y=100∘.