Two chords AB and CD of a circle with centre 0 intersect each other at the point P. If $\angle $ AOD = $20^{\circ}$ and $\angle BOC = 30^{\circ}$, then $\angle $BPC is equal to:
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Two chords AB and CD of a circle with centre 0 intersect each other at the point P. If $\angle $ AOD = $20^{\circ}$ and $\angle BOC = 30^{\circ}$, then $\angle $BPC is equal to: