In the isosceles triangle ABC, if the ratio of degree between ∠ A and ∠ B is 5:2, then the degree of ∠ A is? Urgent need

In the isosceles triangle ABC, if the ratio of degree between ∠ A and ∠ B is 5:2, then the degree of ∠ A is? Urgent need

If ∠ A is the vertex angle, ∠ a = 100 degrees
If ∠ A is the base angle, ∠ a = 75 degrees