exam Maths Puzzle Numerical Ability

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?

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exam Other Question
A person invested $17,000 for one year, part at 10% part at 12% and the remainder at 15%. The total annual income from these investments was $2110. The amount of money invested at y=3x
x+2y=-21