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# The school book store sold 8 more pencils than pens one day. The cost of a pencil is $.05, and the cost of a pen is$.20. If the day's sales of pens and pencils totalled $8.90, how many pencils were sold? A 35 B 39 C 42 D 45 Solution ## The correct option is B 42Amount of pens sold = p Amount of pencils sold = p + 8 0.05(p + 8) + 0.20(p) = 8.90 each pen is$0.20 while each pencil is \$0.05 0.05p + 0.4 + 0.20p = 8.90 0.25p = 8.50 Number of pens: 34 Number of pencils sold: 34 + 8 = 42 The correct option is CMathematics

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