Sally ordered placemats for her restaurant. The cost was $20 for the first 300 placemats plus $0.10 for each placemat over 300. If the total cost of the order was $90, how many placemats did Sally order?

Sally ordered placemats for her restaurant. The cost was $20 for the

first 300 placemats plus $0.10 for each placemat over 300. If the total
cost of the order was $90, how many placemats did Sally order?

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