self Maths Puzzle

A watch is sold at a profit of 30% had it been slod for Rs 80less, there would have been a loss of 10%. what is the cost price in rupees

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self Other Question

R and r are the radius of two circles (R>r). If the distance between the centre fo the two circles be d, then length of common tangent of two circles is If tan theta- cot theta=a and cos theta -sin theta=b, then the value of (a^2+4)(b^2-1)is