P and Q are two points on a circle with centre at O. R is a point on the minor arc of the circle, between the points P and Q. The tangents to the circle at the points P and Q meet each other at the point S. If $\angle PSQ$ = $20^{0}$, then $\angle PRQ$ =

P and Q are two points on a circle with centre at O. R is a point on the minor arc of the circle, between the points P and Q. The tangents to the circle at the points P and Q meet each other at the point S. If $\angle PSQ$ = $20^{0}$, then $\angle PRQ$ =
1). $80^{0}$
2). $200^{0}$
3). $160^{0}$
4). $100^{0}$

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