book Maths Puzzle Numerical Ability

Denchin Donuts sells donuts for 20 cents each plus 15 cents for the box in which they come. Build a table

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x/4-y/3=2 solve for y Can you help me on this? There are different parts to this question.
1) If the demand equation for a product is given by p= -2x+24, find the marginal revenue

2) If the cost eq