Laura is mailing 10 letters and 10 postcards. Letters cost 39 cents each and postcards cost 24 cents each. Which expression below could be used to find the total cost for this mailing?
A. (10) (0.24) (0.39)
B. (10) (0.24) + 0.39
C. (10) (0.24+0.39)
D. 20 (0.39+0.24)
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