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The most anyone is willing to pay for another purse is $$30.$ Currently the price of a purse is $$40,$ and the cost of producing another purse is $$50.$ The marginal benefit of a purse is

Select one:

A$.$ $$50.$

B$.$ $$40.$

C$.$ $$30.$

D$.$ $$10.$

E$.$ $$20.$

$10$

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