A man goes to market to purchase buttons. He needs at least 20 large buttons and at least 30 buttons. The shopkeeper sells buttons in two forms (i) boxes and (ii) cards. A box contains 2 large and 5 small buttons and a card 10 large and 5 small buttons. Find the most economic way (graphically) in which he should purchase the buttons, if a box cost $ 10 and a card $ 25 only.

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