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*Mentor note: moved to homework forum*

A store has been selling 200 DVD burners a week at $350 each. A market survey indicates that for each $10 rebate offered to buyers, the number of units sold will increase by 20 a week. Find the demand function and the revenue function. How large a rebate should the store offer to maximize its revenue?

my expression: R(x) = ($350-$10x)(200+20x)

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