How to solve these sums?1.Find the difference between C.I on Rs 8000 for 1½ years at 10% pa,when compounded anually and semi anually. 2.In the figure, AB is a diameter.APQ and RBQ are st....

How to solve these sums?

1.Find the difference between C.I on Rs 8000 for 1½ years at 10% pa,when compounded anually and semi anually. 2.In the figure, AB is a diameter.APQ and RBQ are st. lines.Find angle BPR.

Link for the figure-http://www.flickr.com/photos/78780315@N06/8437718272/

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