book Maths Puzzle Numerical Ability

you recieved a $9.00 tip from a $56 bill. what percent tip did you recieve?

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book Other Question

Find the area of the triangle bounded by the lines x=2, y=3 and 8x+5y=40. If a cost equation for a product is given by C=2x^2+32, how would you find the marginal cost?

Any help would be greatly appreciated. Thank you.