On Monday, a person mailed 8 packages weighing an average (arithmetic mean) of 12\frac{3}{8} pounds, and on Tuesday, 4 packages weighing an average of 15\frac{1}{4} pounds. What was the average weight, in pounds, of all the packages the person mailed on both days
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A{13}\frac{1}{3}
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B{13}\frac{13}{16}
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C{15}\frac{1}{2}
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D{15}\frac{15}{16}
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E{16}\frac{1}{2}