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Each swing that Susan builds requires $10 in hardware and $20 in wood. She uses the expression 10 + 20 to represent the total cost of building one swing.




Which expression represents the total cost of building three swings?




A.



10 + (3 • 20)



B.



3 + (10 + 20)



C.



3 • (10 + 20)



D.



3 • 10 + 20