Troy is thinking of buying a new computer that is worth $80. He has initially saved $50 and plans to sell his old computer for $20. How much more money does he need so he could buy the new computer?
Troy has $50 + $20 = $<<50+20=70>>70 from his savings and the sales of his old computer.
Therefore, he still needs $80 - $70 = $<<80-70=10>>10 more to buy the new computer.
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