Martha has $20 to spend and would like to buy as many calculators as possible with the money. The calculators that she wants to buy are $4.50 each. How much money will she have left over after she purchases the greatest possible number of calculators?

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Martha has $20 to spend and would like to buy as many calculators as possible with the money. The calculators that she wants to buy are $4.50 each. How much money will she have left over after she purchases the greatest possible number of calculators?