exam Maths Puzzle Numerical Ability

The total profit (in dollars) for sales of x typewriters is given by P(x)=(-0.2^2 + 300x - 200. What is the profit if 500 are sold, and for what value of x will the profit by maximum?

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exam Other Question

You have $40.00. You wish to buy a T-Shirt costing $14.50 and a pair of jeans costing $23.95. There is a 4% sales tax on clothing.Do you have enough money to pay for both? How do you find the value for k so that 9m^2-kn^2 will have the factors 3m+7n and 3m-7n