Sandy bought 65 books for $1280 from one shop and 55 books for $880 from another shop. What is the average price that Sandy paid per book?
Choose the correct answer
A) $12  B) $14  C) $16  D) $18  E) $20
average price per book = (1280 + 880) / (65 + 55) = 2160 / 120= 
<gadget id="calculator">2160 / 120</gadget>
<output>18</output>
$18   The answer is $18.
<result>D</result>
Sandy bought 65 books for $1280 from one shop and 55 books for $880 from another shop. What is the average price that Sandy paid per book?