United Express, a national package delivery service, charges a base price for overnight delivery of packages weighing 1 pound or less and a surcharge for each additional pound (or fraction thereof). A customer is billed $28.45 for shipping a 4-pound package and $83.20 for a 19-pound package. Find the base price and the surcharge for each additional pound.

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you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.

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