A pound of regular nail cost $8.75 and a pound of finishing nail cost $9.45. A contractor bought 7 pounds of regular nails and 30 pounds of finishing nails. How much did she pay altogether?
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Cost of 1 lb regular nails = $ 8.75
Cost of 1 lb finishing nails = $ 9.45
Cost of 7 lb regular nails = $ 8.75 * 7 = $ 61.25
Cost of 30 lb finishing nails = $ 9.45 * 30 = $ 283.5
Total cost = $ 61.25 + $ 283.5 = $ 344.75
So altogether she paid $ 344.75
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