book Maths Puzzle Numerical Ability

If the sales of a product increased by 8% in one year and by 15% in the next year, what was the overall percentage increase in sales over the two years?

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The range for a B grade is 75 or more but less than 85 Eric has grades of 73, 65 77, 74 before taking the final exam . What possible grade would he need to get a B (Assume a maximum of 100 points are possible on the final exam) Please do you have a simple formula for finding the centre of a 2 dimensinal circle if I know 3 points on this circle?