book Maths Puzzle Numerical Ability

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)

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book Other Question
what is 6(h-4) 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?