Sam is planning to buy a new laptop. He finds two options: Laptop A costs $800, and Laptop B costs $950. However, Laptop B comes with a 10% discount. Sam also plans to buy a protective case that costs $50. If Sam has a budget of $900, which laptop can he afford, and how much will he save compared to his budget? Let's think step by step and output the final answer within \boxed{}.
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