SSC CHSL 03 Aug 2023 Shift 1 Paper

O is the centre of a circle and A is a point on a major arc BC of the circle. ∠BOC and ∠BAC are the angles made by the minor are BC on the centre and circumstance, respectively. If ∠ABO = 40° and ∠ACO = 30°, then find ∠BOC.