exam Maths Puzzle Numerical Ability

a-6/15+4-a/10

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Bittman Coffee Company is introducing two new blends to its gourmet coffee line: Premium and Deluxe wich sell for $12.00 and $9.00 per pound, respectively. Both coffees are made f Maximizing profit. The total profit (in dollars) for sales of x rowing machines is given by P(x)=-0.2x^2 + 300x-200. What is the profit if 500 are sold? For what value of x will the profit be at a maximum?