book Maths Puzzle Numerical Ability

The volume of a can of beans is directly proportional to the heigh of the can. If the volume of the can is 300cc when its heigh is 10.62cm, find the volume of a can with height of

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book Other Question

If a cost equation for a product is given by C=2x^2+32, how would you find the marginal cost?

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The sales price of a car is $12,590 which is 20% off the original price. What is the original price. I want the explanation of how this is solved. The answer is already on here but there is no explanation.