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David is mailing packages. Each small package costs him $2.90 to send. Each large package costs him $4.20 . How much will it cost him to send 3 small packages and 7 large packages?
Solution
Total Cost = (Number of Small Packages x Cost of Small Packages) + (Number of Large Packages x Cost of Large Packages)
Total Cost = (3 x $2.90) + (7 x $4.20)
Total Cost = ($8.70) + ($29.40)
Total Cost = $38.10