The correct answer is (A);1050 sq. cm
In the figure O is the centre of the circle and A, B, C are points on the circle. AOB = 50^, BOC = 80^. 
Arun’s present age in years is 40% of Barun’s. In another few years, Arun’s age will be half of Barun’s. By what percentage will Barun’s age increase during this period?