In the following questions, a question is followed by data in the form of two statements labelled as I and II. You must decide whether the data given in the statements are sufficient to answer the questions.

Question 9

What is $$\angle A + \angle B + \angle C + \angle D$$ in the following figure?
I) $$x + y = 90^{\circ}$$
II) $$\angle A + \angle B = \angle C + \angle D$$

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