can someone please help me with this question?

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Answer:
मोहन₹60,000,5% साधारण ब्याज दर पर निवेश करता है तथा एक और भागवह 10% दर पर निवेश करता है। यदि वर्ष के अन्त में कुल प्राप्त ब्याज राशि कुल मूलधन का 7% हो तो कुल निवेशित राशि बताइए। (a) ₹ 20000 (b) ₹ 15000 (c) ₹ 1,00,000 (d) ₹ 34000 ₹(₹
Given,
Angle ABC = 80°
OB is the angle bisector of angle ABC.
OC IS the angle bisector of angle ACB.
To prove,
Angle BOC = 100°
Proof,
This problem can be easily solved by following the given steps.
We know, the sum of the angles in a triangle is 180°.
Now,
Angle ABC = 80°
Angle bisector will bisect the angle into two halves.
Angle OBC = Angle ABC ÷ 2
Angle OBC = 80 ÷ 2
Angle OBC = 40°
OB and OC are angle bisectors of equal length.
Then, OBC is an isosceles triangle.
Angle OBC = Angle OCB = 40°
The sum of three angles of a triangle OBC is 180°.
Now,
Angle OBC + Angle OCB + Angle BOC = 180°
40 + 40 + Angle BOC = 180
80 + Angle BOC = 180
Angle BOC = 180 - 80
Angle BOC = 100°
(Angles are measured in degree. So, the angle here will also be in degree)
Hence, angle BOC = 100°