David wants to buy a bulk package of pens for his office. He finds a package that contains 120 pens for $30. However, he wants to find out how much it would cost per pen if he bought it in smaller quantities. Calculate the unit price per pen. If David decides to buy 75 pens instead, how much would that cost him at the same unit price? Let's think step by step and output the final answer within \boxed{}.
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