Give the step-by-step reasoning process and then the final answer. Mrs. Brown paid her utility bills with 3 $50 bills and 2 $10 bills. How much are her utility bills?
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Mrs. Brown's $50 bills amount to $50 x 3 = $150. Her $10 bills amount to $10 x 2 = $20. So Mrs. Brown's utility bills cost $150 + $20 = $170.
The final answer: 170.
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